even if the plus wires are getting spark, the motor wont fire if the timing is off or out of order. i'd say try to put the distributor in the right way then see if it fires. if you get the car started, make sure you set the timing the proper way too (pull tps, idle ~750 or so), and i'd retard it 1/2 degree for every psi of boost you are running (so if you want to run 6psi, run 17* instead of the stock 20*).

it might have been that when you originally started the motor as turbo, it ran, but idled bad since it was pig rich with no s-afc compensation. it probably fouled your plugs out, then you might have installed the spare one wrong, and then reinstalled the original dizzy wrong again, or the fouled plugs just wont let it start.

pull the plugs and check them to make sure.

also after trying to start it a few times, it might have flooded the chambers with fuel (IIRC, all 4 injectors are firing during startup) so air them out or wait a while.