I own a 1974 Fleetstar 2110A, with a gas motor. It has VS 549 stamped on the passenger side top of the block, with 136739 underneath it. Am I correct to assume that is the engine model and serial numbers? I was wondering what the horsepower rating. My owner's manual says 64.8 hp. Yes, I have the original owners manual and the original Allison transmission manual. The truck also came with the original Van Pelt wiring and plumbing diagrams.