Master...I am an ignorant padawan....teach me...
If you have to rewire the car (which should be done w/ every 30+ yr old car) why not just build it from scratch to allow for a future MSII/3 build? You see us talking about all of the stuff that we are doing, want to do, need to do to automate a process w/ our computers and of the three, that exchange here, I am by far the most schematically challenged of the three of us.
Yet, I built the whole original MS II by myself, and the thing started w/i minutes of dickin with the tune.
Considering that you intend to drive the car, and with the possibility of using the SC engine that you are considering, the ability to tune a Megasquirt dead on to what you want to do, or modify it to do something later (in my case) is right in front of you.
I've offered to build the basic kit for you, because that is the easy part (for me at least). The build instructions are my kind of instructions....they read: Solder this to that.
I'm pretty good with understanding electronic current flow paths,... It becomes a challenge when I have to understand a transistorized circuit
Something like this jugphck.
This is where steve comes in....(Without him,....I may as well put a "dizzy" and a carburetor on the car)
But you're a smart guy like me Dave,...You should be able to do this. I mean,..who else here had the wherewithal to take their upholstery apart, get out their little Suzy Homemaker sewing kit, and their paint gun,...and rebuild their interior back to new status w/ only some paint and some thread?