GM TBI on my 1970 360 duster

dusterbd13 said
2. the car lays down 427 horse at the wheels. should i use the biggest throttle body i can get my hands on, or shoudl i go with a little smaller to keep air velocity and throttle response?

You're not going to find a TBI that's too big in a junkyard. I've seen motors that put 200 hp to the wheels get starved for air with a stock 350 throttle body. It would ruin the sleeper effect, but I doubt two 350 TBIs on a dual quad manifold would be too much for this motor.

I presume you've got some way of hacking the stock ECU? A speed density computer that's used to a truck motor that revs to 4,000 RPM is not going to know what to do on a high winding screamer, so you're going to have to teach it.

3. ignition. Currently im running an MSD box and rev limiter setup from an 80's winston cup car. Stock electronic distributor. The GM ECM can control the timing as well, so it would be stupid not to use it. any idea how to do this with a chrysler distributor?

Lean Burn distributor + 7 or 8 pin HEI module. I have this combination on my Dart. Note that the engine will run if the pick-up is wired backwards, but timing will be all over the place. I'd keep the MSD box though.

4. should I? the car is built as a sleeper. looks all but stock at first glance. Very clean and uncluttered underhood and everywhere elso. Im worried that if i convert to EFI, all the extra wires and sensors will be a dead giveaway and ugly to boot. it aso only gets driving a couple of thousand miles a year. Mostly because it drives so bad.

anyway, goive me your thoughts.
Michael

What good is a car with a mean sucker punch if you can't take it out and find suckers to punch? It sure sounds as if it needs some better tuning, whatever option you chose.