I'm in the process of changing the fuel pump . I'm thinking about changing the alternator too since i have to take it off to get to the fuel pump. What's the most powerful alternator I can run on the stock wire gauges? I'm looking for b4b (bang for the buck) solution.

1973 Dodge Charger SE 400 automatic transmission. Curb weight: 3800 lbs. All stock so far. Goal: Reliable everday driveable warmed up 400 as close to 400hp as possible, then a 470 stroker if need be. Don't protect a feminist when the collapse comes!