Start and Ignition Problems on 71 Demon

Latest update, fixed my no start problem with a good cleaning of the contacts on the bulkhead connector. Yellow wire from starter relay to bulkhead was only getting intermittent contact. Thank gawd it was not the ignition switch.

Car cranks, have spark at coil and even have spark at a couple of the plug wires I pulled off, but the car still will not fire....could I have screwed up the ignition timing so badly when I replaced (mixed up) the plug wires that it won't even fire at all? I thought I went thru all the steps to find #1 cylinder at TDC and go from there, but maybe I'm still way off...Puzzling, but I am making progress....thanks in advance!