FBO still making kits? I have used a couple in the past and they always worked well.
I use the FBO box on my Hemi Charger. Has worked really great, only change from using a Mopar box is the need to jumper out the ballast (I hollowed out a ballast and used a wire soldered in place) and a Pertronix coil which they spec.
No issues, really like it.
Have a bone stock 440 in a 70 Challenger, running the classic Mopar electronic ignition conversion on that. Using the Jegs blue ECU (same that Rick E sells on eBay), has worked great with no issues for several years. I tried it on the Hemi and it worked well, but the FBO box seemed to give me more at all RPM’s (seat of the pants test).