You can use the CTS, Vette or F-body accessories. You will have to run the AC up top using a quick perform bracket, unless you set the engine forward 1 inch, then you can run the A/C down low, but only with the F-body accessories....the CTS and vette balancer offset are closer than the f-body and cause interference issues.
If you build your own AC bracket, you can run a Sanden SD7 down low with the CTS and Vette accessories, the other Sanden compressors will be too large, unless you move the engine forward.
I have installed several LS conversions into 63-66 Novas with both stock front ends and clips. The only off the shelf bracket I have found is from street and performance for the LS1. They sent me a bracket for the LS3 and even with the engine set forward in the stock clip, it still hit the frame stand/shock housing boss, but just barely. I have not tried a LS3 in a clip with their bracket though, but I suspect it will hit.
T,
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