I think you have other problems...I have never, ever heard of a gear or pump drive that didnt fit right. You said it wasnt seating right...meaning the collar was not sitting all the way down on the intake? Did you line up the tab on the bottom of the distributor shaft with the slot on the oil pump drive shaft before you dropped it in? If they dont line up, it wont drop all the way down. Sometimes you might have to try this several times before it lines up. Did you turn the oil pump shaft with a long screwdriver to get it into the right position? Something doesnt sound right to me. There is no way a distributor gear can 'jump' a tooth if it's seated properly. And the only way it wont be seated properly is from the above problem. Keep us posted, this is interesting. And for what it's worth, I have tried several different systems, and always go back to a basic HEI....cant beat em! John