Removed original voltage regulator and now it wont start

Took out wires you didn’t need anymore? That right there would be where I would start, except to get a wiring diagram for your car. Sounds like you’re trying to run a GM style single wire alternator and eliminate the ballast system. It can be done, but you need to understand how the Mopar ballast system works.

As for the 100a alternator, the early A cars and the wiring in place are used to 28a of alternator current, maxing at 35a. And, all of the power goes directly through the bulkhead and through the ammeter guage. At least do the voltmeter bypass before too long.