I just installed a MSD TBI on My 3.9. I had been using a Edelbrock Carb. I like it. But Your 4.6 looks like You have an aftermarket EFI (Picture of Morgan Shake Fix). If so what is it? BTW: As My +8 is registered as a 1973 Emissions are not a problem for Me. I don't think the MSD TBI satisfy any emission regulations.
