Can you help,as i am going to buy a 521ci eagle conversion kit but,the one i am being supplied is externally balanced,my engine is 1976 460ci internally balanced,being told that all i need to get is a externally balanced spacer behind the harmonic balancer?Can i still use the same balancer,ie, not neutral,internally balanced? Are there any differences with the later crank,ie,rear seal locations?
What is the differnce between 1968-1987,460's,to later engines?