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Stock on my 302 was a 55amp alternator. Should upgrade to something else?
Short answer is, we can't tell because you didn't say what on the car is using power. If its stock, then the stock capacity will be fine. Otherwise you have to do some math

Power = Voltage X Amps.
so

12.6 VDC electrical system X 55 Amps capacity gives you about 700 watts of sustainable out put.

Using the stock car and stock alt as a base line, what did you add which will increase the electrical current requirements?

if its a continuous draw kind of a accessory then you might want to use the above formula to come up with the amount of increase needed to satisfy your needs.
 
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