400 B block

I am only interested in a bracket motor,NO street driving. Muscle Motors has a 4.250 stroke crank for less than 440 source.I don't know if I can bring myself to use a crank made in china.One thing I notice about the 4.250 stroke is that they use a shorter rod and I beleave that would take the wrist pin out of the oil ring grove.I don't know much about the block I have,it came with a car I bought.I've never had a problem with a 440 block. I have broken a 6 pk rod & I have broke a 6 ph crank at different times.