DIM Electronic Advance Ignition

You are correct about the 8 pin module having a limp home mode.
The the white wire terminal of the four pin connector controls advance and if supplied with 5 volts DC will retard the timing by 10 degrees. (limp home mode)
I don't currently know what a forced intake engine needs for a retard amount, but since I currently cannot vary this as it is a set amount, I can't incorporate a user settable advance or timing curve.
I talked to the guy that made the Rabid Gator timing computer, and he said "just use a Megasquirt EFI computer and only use the timing functions"
At $400 just for the build it yourself kit, I can't justify that price wise.
I just want an HEI ignition system where the user can set the base, curve and total timing from the drivers seat with a interactive readout.

Too much to ask right now it seems.