Mine is a 275/40/18 also. They are 26.7 tall. I think the 275/35/18's look great on the 69's, but the 67/8's need a little extra help filling the round wheel well. The 275/40's are what DSE recommended for the Budniks in the picture and Driverz Inc recommended the same for my new wheels.
I'm assuming that your rear has a standard multi leaf perch. If you measure the energy suspension leaf pad before install they are 7/16's top and bottom. If you then measure how thick the leaf spring is and measure the gap from your shock plate to top of the leaf perch you will find that the leaf is only about 3/16's skinnier. So you are using 7/8" of poly to take up a gap that is only 3/16's. I used the 1/4' plate because I wanted to be sure I had enough thickness on the leaf to get a tight pinch in the perch. It is also much much easier to center the rear without the poly pads in there.
As far as ride height goes if you add the plate to the bottom of the leaf you will have the car raised as high as possible without messing with the shackles. If you put it on the top of the leaf the car will be 1/4" lower that max height.
I have a couple extra plates in my garage. I'll go take a couple pics and post back in a few.
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Jason Mitchell
1971 Camaro 416 LT1 Project
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