The ideal setup for an inline six with three ports would be sequential electronic fuel injection timed to fire the injector a little before each intake valve opens. Buick came out with SEFI in 1985 or so on their 3 liter V6. On a stovebolt, only one injector per port would be needed, since the intake valves for the cylinders that share the ports open several degrees of crankshaft rotation apart. Of course, all the common computer inputs would be required- - - -RPM, crankshaft position, camshaft position, throttle opening, manifold vacuum, coolant temp, ambient temp, exhaust gas oxygen, etc. The technology has been around for 40+ years, so programming a controller chip wouldn't be much of a step for any computer geek.
The cost of a limited production run of that type of system for the few stovebolters who might want to run it would probably be outrageous.
Jerry
