I have a 76 nova and i just recently had to swap the original 250 w/ integrated intake to a 1970 250 i already looked up the casting numbers and it said it was cast in december of 1970 and i bought a new 168 tooth flywheel and a starter to bolt up on the '70 250 but it wont bolt up because the flywheel is hitting the nose cone and the pinion on the starter any ideas?