The difference between 302 and 351 distributors is the size of the oil pump drive. So the lower distributor shaft is part defining what engine it works on. The rest of the distributor is the same. Also the electronic distributor was the same from '75-'77. Only the '76/'77 were what Ford later called Duraspark. The ignition module defines Duraspark vs electronic ignition. This was the stock ignition so there's no stock vs. Duraspark choice. Cheesy Chevy HEI and other after market ignitions are a downgrade from stock Duraspark read this;http://www.ifsja.org/forums/vb/showthread.php?t=19440. It's very informative and long ie. not for the lazy.










