FBO's black HEI ignition box

The main advantage of that FBO box is that no rewiring needed if you have a 1970's e-ign car. What is funny is people with a points car who want to upgrade to e-ign and chose the Mopar ECU with its complex wiring (dual ballast resistors, ...) then install this FBO box. Ditto for 1970's cars with degraded underhood wiring. Using a GM HEI is much simpler wiring and a stronger spark (no ballast). Their 8-pin HEI is the best choice (1985-95 small-cap distributor) since comes with GM coil and cable which connects the two and robust sealed connectors. TrailBeast (earlier reply here) used to sell a kit. I use on my 3 1960's Mopars. Another advantage is that some EFI systems (Holley Commander 950 on mine) can control spark timing via that HEI module.