Setting up F20 and F30 for pulling

....does Merfeld(Dubuque, Ia area) build engines for the old F20's and 30's too, or does someone over by Peosta that runs the really strong pulling F20 and 30 with the wide front end that I watched pull at the Ankeny Expo a few years ago do those? If neither of these fellows do this commercially for F20's and 30's, do you know of anybody else around Iowa, or elsewhere for that matter, that does? Or at least of someone who provides components for one to build their own? Would anyone on this board care to offer any advice to a wannabe F20/30 puller what he has to do to make one of these old girls give all of the others out there a run for their money while still holding together and not busting a crank or otherwise blowing to pieces, and please give me some idea as to what to expect to have to spend and be consistently competitive in the "original appearance externally but do what you wish internally class", which I believe might be division 3?
Thanks in advance to all who care to respond to a new guy on the block.

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