On a recent Pontiac V8 build I did, the machine shop that I use, that specializes in crankshafts told me if the engine is balanced internally, the flywheel will be balanced by itself. I didn't have it done and felt no vibrations or anything odd. I really doubt you will have any problems. A fellow I work with came from UPS, he was one of the truck mechanics. Listening to some of his stories about the 292's, I don't think you could ever hurt one.
Joe
