Who makes a HEI Style/Male Connector cap for an FE or Duraspark distributor?

 

If you mean the 8mm flat distributor cap, all you need is the adapter that goes between the distributor and the cap. You can pick one up from a salvage yard off any late model V-8 with a distributor. Score the plug wires, cap and rotor and they will probably fit your engine. I got one off a 302 and it all fit.

Try this link: https://www.ford-trucks.com/articles/largecap.php

 

MSD Cap-a-Datp for Ford v8 pre 1985 from summit. Costs less than 30.00
I use this and I like it.