Hey Raj, Lynn here. I like the 427 in the Belair/Biscayne and the 454 in the Caprice. And, I think, both presented as original. Something about the original or OEM way of doing things suits my tastes these days. This Biscayne has a unique attraction for me, it's soft spoken on the outside and full of punch under the hood. I think you would be happy with a combo similar in nature. Good thing for you, is that you have most of the parts in reach. Will make a good project(s) for sure.