I'm trying to put a new 8" harmonic balancer onto a Goodwrench 350 engine. I bought a balancer cover with the timing marks on it. The problem is the timing marks on the balancer vs the cover aren't even close. Looking from the ront and with the keyways in the 12:00 position, the TDC groove in the balancer is at approximately 10:30 position and the TDC mark on the cover is approximately 11:58 position. I wonder if its the wrong balancer?