Doing my weekly e-bay search for nos Motorcraft stuff and came across this. https://www.ebay.com/itm/NOS-NIB-DA-...53.m1438.l2649
Seems like a real deal if you have a 240 or 300 and are thinking of going electronic. I'm sure ND knows what it is supposed to fit exactly.

 

D5TZ-12127-F .. 300 I-6 Distributor (Motorcraft DA-1442) / Obsolete

1975/78 F100/500 & E150/350 except CA emissions.

 

ND, What distributor cap goes on that thing? I don't own an I-6 engine but it's hard to resist buying one because it's such a good deal. Best I ever did on an NOS one for a V-8 was $75 and free ship.

 

1975/76: D5DZ-12106-A .. Dizzy Cap (Motorcraft DH-353).

1977/78: D7DZ-12106-A .. Dizzy Cap (Motorcraft DH-367) & D7DZ-12A217-A .. Adapter (Motorcraft DJ-1)

1977/78 cap has male ends and attaches to the adapter located below the cap. The adapter probably won't be needed if you already have one.