71 chassis manual will probably get you pretty close, especially given that previous owner has already hacked up the wiring harness.
given that you were having a starter motor problem previous and didn't have an ignition issue until you took the alt out i have to suspect that this is a problem with the re-assembly.
either way, the HEI cap is pretty hard to screw up. you can jumper +12v directly from the battery to the distributor and you should have spark when the engine spins over. this eliminates all the dash switching as failure points. if this gives you spark and you didn't have it before, you're going to have spend more time in the wiring harness figuring out why +12 isn't making out to the distro.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)