I just bought some multi leaf replacements for my Nova which was a Mono setup, I bought them from JC Whitney just because they were the only ones that have a multi replacement that bolts right to the stock perchs. Has anybody used these before and will it increase the ride height. I have not installed them yet.How you you go about dropping a 1967 Chevy Nova Rear. Lowering Blocks? My car has a 396 BB.