Update: I went to pull out the 80A main fuse you mentioned. Ummm, well I suppose the prongs were corroded into the fuse block itself, because they stayed with it, but the plastic and fusible link came off. I'm going to assume that was indeed the issue. The other fuses come out, so I'm unsure if I'm going to rip out those prongs and replace that fuse, or replace the whole fuse block (and probably switch to blade style fuses). I guess it depends on how cooperative the broken-off prongs are when I try to pull them from the fuse block. Bummer, 10 minutes of work and I need to buy parts already. -.-
A lot of the wiring in this thing is fairly corroded. I might give up on trying to get it started, and just pull it apart. I'm going to pull the engine for a rebuild, which will leave me tons of room to replace all the wiring. That brings me back to my question about stand alone ECM's. Is it doable with this thing? If so, I need not bother replacing all the wiring...I can just yank it all out and build a new harness for the new computer.
I've toyed with the idea of swapping in a Honda engine, but I reallllllllllly don't want to modify the car that much. I'd much rather keep the original engine. That all hinges on the computer situation, though. I need to be able to tune it, otherwise there's not much point in building up the engine. Sorry for all the questions, I'm extremely unfamiliar with the Capri. In fact, I'd never seen or even heard of this car until I found it on Craigslist.