I got an Accel billetproof distributor for free from a buddy who had fried the module in it (something has shorted out), so I pulled the vac advance and module out and ordered a 7-pin holley ignition module from summit - they're on special for $27 right now. I'll have to fab up a mount and a wiring harness, but I think it's going to come out pretty slick. I found a web page with some great info on the GM ignition modules and how to hook them up to the 'mega squirter II'...
Many thanks to all who posted responses. I'm sure when it comes time to try and finetune the basemaps I'll be back looking for brains to pick
