I'm in the planning stages of a Olds 455 swap. I just talked to my neighbor last night about it. He has run both a Caddy 500 and an Olds 455 in the same truck and according to him there isn't much difference in torque and power. We looked up the specs in the Chilton's and the numbers were a tad bit higher for the Caddy. Any of these 3 engines (Caddy, Buick, Olds) will do just about the same and require the same amount of work to swap in, and will definitely be worth every penny you spend on them. /forums/images/graemlins/thumb.gif