Just thought I'd share some information and experiences about these 2 different boxes since I've had some 'experience' with AGR and recently did a replacement to a Lee power steering box. I have a 69 Camaro with a ZZ454, NOS 69 BBC motor mounts and frame stands, and Hedman 2" primary headers(part number 66001).
AGR: 12:1 power steering box, 800 series Saginaw, custom billet AGR cap which is a bit thicker than the stock steel cap
AGR Install: In order to install this box, I had to ding/dimple my headers in 3 locations. I also had to grind down one of the edges of the billet cap and replace one of the bolts with an allen head bolt. This is the fault of my headers, not the box. Other than the headers and the tight tolerances, it bolts right in. I do have to loosen my headers and remove the pitman arm before installing or removing, and it must go in from underneath the car.
AGR Review: The first box I installed had way too much slop in it. It was scary to drive. I removed it and sent it to AGR where they inspected it and verified that it indeed had an 'unusual' amount of slop in it. They 'repaired it' and sent it back to me and I reinstalled it. It was indeed a bit tighter but after only 50 miles the input shaft seal blew out and spit fluid all over my ceramic coated headers. Lovely. This time I sent the box back to Summit and they sent me a new one. This '3rd' attempt was better, but there was still too much play in it, but I was so tired of dealing with the installation/removal of the thing that I just left it in place. This box was in use for about 1.5 years until I removed it last week. Also, the finish on the AGR box is non-existent, so it's a good idea to paint it before installing or else it will start rusting fairly quickly. Overall, I can't recommend AGR to anyone. Some people have had great luck with them(I'm jealous), but I had very bad luck. The good news is, I now have a great anchor for a canoe.
So I called Lee Manufacturing and actually drove to their shop and had a chat with them in person and saw their facilities. Very nice people. I ordered a new 670 power steering box, rag joint, and I had my pump re-valved to match their box. They said they'd be done by the following Friday and were finished a day early on Thursday(how often does that happen?). Including tax and shipping these parts back to my door, it was about $780 total. Expensive? Yes. Worth it? Keep reading.
Lee Box: 670-series 12.7:1. Slightly smaller and lighter(about 6lbs) than the 800 series box.
Lee Install: Even though it's slightly smaller, it has 2 critical places where it actually sticks out farther than the 800 series causing it to fit worse than an 800 series box when using headers like mine. @#$@#$! I had to ding in my number 5 and number 7 primaries even further than I had to with the 800 series box. The dings are so bad that they are most likely restrictive, so next time I pull the engine I plan to remove the headers and have the number 5 and 7 primaries cut out and re-worked by a custom header shop. Other than the headers and the tight tolerances, it bolts right in. I do have to loosen my headers and remove the pitman arm before installing or removing, and it must go in from underneath the car. Same process as the 800 series box.
Lee Review: Now we're talking. Very tight steering. No play or slop. Very responsive. I should've gone with Lee in the first place. It's only been in for a few days now so I can't provide any long-term/reliability review at this point, but so far I'm very happy and wish I had used them in the first place. It would have saved me an extreme amount of trouble and frustration. Easily worth the extra money.
Header Recommendations: If you have a first-gen Camaro and a big block and want to run an 800 series or 670 series power steering box, I would NOT use the Hedmans or any other headers where the number 5 primary runs straight down. I would go with Lemons or some other header that has the number 5 primary loop over the number 7 primary, and the number 7 primary curves in more quickly after exiting the flange.
Hope this information helps the next guy.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Power Steering: AGR vs Lee, 670 vs 800, 69 BBC Camaro, Review
Unfortunately, I won't have the funds to build it until later next year, so that's a long ways out. 
Definitely look forward to RTTC. I've changed a number of things on the car to make it exactly as fast as it was last year. 
See you next month!
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