vw bus amperage question

[Sdcontroller]

hey guys, so i have a 1971 vw bus with a 38A generator. i know i need to upgrade to an alternator, but my question is what size?

not sure if this is accurate but i read i can estimate the amps being drawn by this equation:

rms watts/ peak watts * fuse value will give approximate amp draw?

if thats true then my alpine mrp-m500 would pull 30A.

and my hifonics zxi80.4 would pull 15A.

if all this is true i should be able to get away with an 85A alternator, right? i have a couple options with what size alt i can go with. 75, 85, 90, and 95. there is about a $170 difference from small to big. should i just **** it up and go with the 95 or does it look like i can get away with less?

take it easy on me, im a new guy. all opinions appreciated. thanks

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[Phoenix Risen 10+ year member]

since electrical is the last place you want to skimp on and with alts bigger is most always better i would go with the 95. but you should be able to get away with the 85