you need to list some specifics, like the casting number of the crank. hollanders lists a variety, and sometimes they say that you can swap, but the rods have to part of the swap
and if i'm correctly remembering, it isn't just a matter of swaping a later crank, bec there also may be block work to be done. these guys do the whole thing;
http://www.inliners.org/becks/index.html but if you're not doing bonnevile or 4-5k rpm, do you want to go to the extent of your thoughts?
