My son recently bought a 94 gt that has been parked for years. It has an older 331 eagle rotating assembly in it. What we can't figure out is,the harmonic balancer us stock 50 oz,the flywheel is stock with the 50 oz weight removed and 3 holes drilled in it from a machine shop. Also the crank has 3 deep holes drilled in the 1st counterweight. Is it possible its a zero balance and the extra weight was taken out of the crank to use the 50 oz balancer? The guy couldn't remember and tge machine shop is out of business. Thanks for any input.