Interesting, the Merc Marine and Jacob C4 all basically look like a
Ford TFI coil.
I'm not a 3rd gen guy but I'm using two HEI igniters (4 prong) to
drive 2 Ford TFI coils (one connected to each leading plug). No
trailing. It all works great and flawlessly. I sourced mine off of
some F150 pickups at the junkyard for $10 each. These work
up to 8K with no issues. Heres a pic of the install:
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs
Project Fat Nikki Budget 12A rebuild Video setup < $30.00