Can’t you just run wagon springs in the back and solve all the problems easily? I did this on my other ‘69 A Body because I wanted a slight rake. I tried the HD springs for my year first and wasn’t happy. It was just a stiffer same height ride. The wagon springs gave me a comfortable spring rate with the added height I wanted.
Moog 5235’s look to be the ones from ‘66
If you look them up on Amazon you can read a review someone did where they used these springs for that exact same reason (their photos below). If that doesn’t give you the look you want then I’d guess you have the wrong springs up front or possibly need to mod them to offset your change in weight up there. Although, I’d really guess the taller springs in the back will transfer some of that load back up front and drop it a little as it has that “engine-less” look already.
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