Apparently the balancer that the previous owner used is for a 305, found some junkyard writing on it and verified it on the autozone website according to size. After pulling the balancer I found damage to the crankshaft that extends back about a 1/2 inch and maybe 1/8 deep but not affecting the keyway. Looks like somebody installed it with a hammer yikes. I would suspect that theres more damage but think I will shell out the 50 buck for a new one and see what it sounds like.