I can remember reading somewhere about a backyard fix for this, you can use the Ford electronic ignition, if you resist down the tach pulse to the GM computer to 4.6 volts or something - research it I can't remember where I read it, then you have to add a GM Knock sensor and a Gm Temperature sensor, and if it doesn't already have a single wire oxygen sensor, it needs one of those too.
firing order isn't so much an issue if you use the factory distributor hooked up to the vacuum advance, and just use the tach pulse as the baseline to fire the injectors, it's mickey mouse, but it should work.