i have been buying parts to do this for the last year way before it died
just sort a cam the springs to match, bore the block and prep, balance rotating assembly
I don't want to tell you what to do, but I did the same thing when I was building the 440 in my R/T and it wasn't a good idea in retrospect. There were several things I somehow overlooked and had to change or modify, things not even related to the engine.
Example: bought these Hooker Super Comp 2" headers, hell yeah right? They'd look cool and I was putting 3" exhaust on it, the magazine says they fit etc etc. Plus, they were on sale with summit bucks coupons and I got a free shirt. why not?
Well, when I went to hook my brake lines up, guess what happened? The proprtioning valve just happened to sit, in the factory location, where one of the tubes tucked up near the frame.
Had to completely redo that line, which was a PERFECT FIT all because of the stupid headers I bought waaaaay ahead of time.
That isn't my only story either with buying parts ahead of time, I got alot of them, won't ever do it again. Best thing is to get a plan together and decide the route you want to go and stick with it as bes as possible and weigh ALL the factors, not just what your messing with at the moment.