Congratulations on your success. I'm sure my mind will explode if I ever get to the point of programming! The Autotune feature has really got me, it simplifies things so much, and makes it accessible. And with less head-scratching and wrench-throwing!
Shortly after I posted, I found that coil. I also found the pigtail/plug for that coil. And I can use the injectors I have, if I run 25 watt 7.5 ohm resistors in series to each injector. $0.89 each at Newark Electronics! This limits the current running through the Speeduino while using the low-Z injectors.
My existing coilpack is Ford dumb coil to work with Megajolt, mounted over the bellhousing and using Ford Escort wires. I'll change the coil side ends, make a new mount and that's that.
I'm very lucky in the spacing/packaging arena. My engine has CB Space-saver intake manifolds, so the carbs/throttle bodies are reversed. Fuel rails, injectors, and idle air-bleeds on the inside. I've got a 911 shroud so that's not in the way either. Final bonus: fully-opening clamshell instead of Speedster claustrophobic compartment.
I'm still looking at about a $300 investment, plus the coil and some wirework to build a new EFI harness. I've got a spare 4 wire harness(flat tow lights) running up to the fuel tank that I can use for fuel pump power. All the rest of the wires are short, ECU is going behind passenger seat. Really, the only thing I need to run up front is the fuel return line.
Hmmmmmmm. I can do this.