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

The problem with stock alternators isn't the total output, it's the crappy output at idle and just off idle. I'd put an alternator on the car like a Denso that has better utput at idle speeds to keep up with any potential loads.

2 Fans could pull 10 amps or 50+ depending on what they require. Where you pull power is a HUGE consideration on these cars.

Not sure how you plan to wire things, I would run headlights and fans on relays using separate circuits from any of the OEM wiring. I can help you there building custom kits if you are so inclined.