Just posting this note for someone converting same motor. I had a good talk with Patrick Dykes of Patrick's Antique Truck Parts etc. He said the crank length isn't an issue in an Advance Design GMC. It is 1 1\2 inches longer. He did say to switch out to a 3\8" narrow belt harmonic balancer from a 235 and replace the pulley on the GMC water pump with the same.
Reason being that some GMC harmonic balancers have a hard rubber sleeve that tends to wear out over time and could cause problems down the road. (Didn't know that).
Tom
Last edited by tom moore; 05/20/2015 9:13 PM.
