Relating to 235/261 ability to swap with 248/270/302...timing cover, thrust plate and spacer, bell housing, flywheel inspection covers, clutch assembly, stomp starter linkage, fuel pump, distributor and coil. I think the starters and generators swap, too, starting with 1955.2 Chevy's and 1956 GMC's once both were 12 volts negative ground.
Matt
