For a while there I was going to do a caddy 500 but I decided against it due to several issues (fitment, cost, parts limitations, etc..). So I'm going to build a 454. Now the question is should I buy a used one and build it up or should I buy a block and slowly add components as I see fit. It will be next year before I do the swap. One big factor is if I set the money aside I'm kinda worried it would get spent on something else so thats a big reason as to why I'm leaning towards buying the engine in pieces, a little here a little there and by next year I should have most of whats needed. The other reason is because I can decide what goes in it. The only problem that worries me is will it cost a lot more to do it this way? I was looking around on ebay and they had used blocks that look to be in rough shape for around $400, they would need to be checked over etc and I'm not sure what that would cost. Ideally I would like it to have around 400 HP and 500 ft lbs of torque. Plus I would like to hit it with around a 100 HP shot of NOS. The NOS would rarely be used but I want it available if I need to use it in a mud pit. Any thoughts, suggestions?