Stock alternator up to the task? If not, how many Amps will I need?

Fire it up, turn on ALL your accessories, measure your amperage with an amp clamp and see what the usage is.

Then shut it off, get in another car and start it, put it in drive and drive to the auto parts store, and buy as many relays and connectors and big *** wires as you afford, and relay that **** until your car has more electrically operated switches than ENIAC.

Then look up bulkhead bypass, do that, and be sure to add the fusible link.

Then get a bigass alternator (now with extra molecules) and install that, and you're good to go.