Of note even the front springs of the LT1 Camaro will let the front sag and bounce a little because the Caprice LT1 is Iron headed and the Camaro LT1 is Aluminum headed. As Brandon said you really need to find a donor LT1 Fbody to get everything working correctly otherwise you will pay a fortune in harness splicing unless you are a good DIY, in which case you need wiring schematic, for V6, V8, Camaros and the caprice to make it all work.
2000 Red 1SC Z28 A4 - dead for now
2005 Black GTO M6 6.0 - Split daily driver
1987 Silver Fiero GT - Split daily driver