ED,
The rods are from a 1950's, 308 Hudson. You have to hone the caps for the slightly bigger SPS rod bolts, narrow the big end to fit the GMC crank, resize the big end, balance the rods and rebush the small end to fit the wrist pins. Then you turn the crank down to the Hudson bearing size and use a certain Chrysler flathead rod bearing.
Unless your going to race this isn't worth the time, trouble amd expense. By the way, what are you going to do with the engine?
Ron
