I definitely agree on the ECU swap with another car, I'd hate do damage another guys car. Unfortunately the only other local Porsches around here aren't 3.2s anyway.
The engine swap wiring does worry me, it's really quite a mess. The challenge is to redo as much as i can, but with the 1978 circuits and fuse/relay setup being different to the 1984 engine it's a challenge.....I've built and wired from scratch two Cobras (with a little help from an auto elec) so I'm up for it