I remember someone here being a vendor for a variety of EFI packages but I can't remember who it was.
I'm looking at resurrecting my home made EFI intake and plopping it on the 543. I was never satisfied with my old outdated Electromotive TEC II system and would like to find a self learning port EFI system with timing control that suits my needs. I'm sure my old 120 lb/hr injectors are no longer serviceable but they'd be too big anyway. My 1700 cfm throttle body is a bit iffy but I bet I could make it work on an engine that big. I'm not sure if I'd have to dig out the old 60-2 trigger wheel or if the new stuff uses the distributor for rpm signal.
Anyway, whoever you are, poke your head up so we can talk bidness.