Well I had a 451 built about 15 years ago and it worked o.k. but I wasn't overly impressed. 2-years ago I had a 496 cubed 440 built for my 1 ton and I really like it as far as a torq monster. It not set up like one for a high performance car but I can see it's potential. If I can fit a 440 size block easily into my 67 Barracuda and have room for large tube under chassy headers I would go that route but I also want to consider the weight of the 440 block vs. the 400 block.
