Dim efi

Thanks for the timing information, that will helps.

The information I have found suggests the the chevy TBI alternates in normal running, however batch fires for startup and high load or WOT conditions. I can do the same. On low end the alternation may improve idle quality and reduce emissions.
Oops, you are correct a dual plane will require batch fire. I guess it might be best to have two modes of operation.

My ECU has provisions for O2 feedback. I have used wideband O2 with mixture table on my 2.2L turbo application. I also monitor a few conditions before entering closed loop operation.

When I say my ECU, it is not Mopar it is one I designed. I have been playing with it on different applications since 2003.