I'm also in the process of buiding my first blown alcohol motor and have heard a million different opinions, confusing to say the least. Mine's a Ford 572, 4.5x4.5 using an aftermarket iron block. I bought a Velasco billet crank $3,300, because everyone I talked to said a forged crank would not stay together. Still need a set of rods, bb chrysler, and everyone also said I have to use aluminum because steel rods will crack the crank because they deliver too much shock, not sure? I have the dual keyed crank and blower hub as well as everything else but rods and pistons. Plan on using 11.5-1 compression. One thing I'm still undecided on is O-ring the block or not, heard several different opinions on this also. Chris