I think that if there was a way to acquire SB rods before the bottom is narrowed they would work. Another option would be adding material to one side of the crank journal.
It may be on that FIERO site that I read about putting a 181 crank in a 151. I can not remember what rods and pistons were used. I have a complete 151 from a YJ Jeep that I may play with and also a professionally rebuilt, U code I think, cross mount engine. This is truly an interesting engine family.
