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Thanks for the reply. Interesting. I purchased a MSD billet distributor for the 331, only problem is that the oil pump/distributor drive shaft is different for the automotive 331. Our Marine 331s have a ~3 inch longer stub shaft above the cam gear that drives our distributors. Any clue as to how he ...

My M45Ss came with the optional "shielded" Auto-Lite distributors #IBH 4001 UT (shielding was to prevent radio interference). My immediate problem is that the wires are at the end (way past) of their service life; the ceramic insulators are cracked/broken etc. The wires screw into the top ...