[Big Dave]

What kind of vehicle are you planning to put this engine into, pan?

I don't think getting somebody to do the control work you speak of is all that impossible. There are bunches of aftermarket engine control houses and that biz is super-competitive.

Go to their HQ. Phone calls or Internet won't do. Make an appointment with the big cheese and tell him what you are looking for. Layout some C-notes for motivation. You'll have to sign some waivers. It is, after all, your idea. They don't want to be held liable if your engine explodes and causes a wreck.

DoD (now called Automatic Fuel Management) is common as dirt on 5.3, 6.0, and 6.2 V-8s. Maybe even 4.8 V-8s. I can't believe somebody won't do this for you.

What you are trying to do is a "parts-bin" engineering job. You can use existing hardware but you need some special hardware.

If you are gonna re-engineer an engine, act like an engineer. Somebody can fix you up.

Don't expect it for peanuts. You wouldn't want a doctor doing heart surgery for $1.98. Don't expect pros to help you until you treat them like pros.

Don't betray your idea by trying to Cheap-Charlie the execution.