Stock Alternator? Make upgrades? Porsche?

[Mysticle31]

I'm looking to get a 72 SB currently stock. Plans for a motor of some kind. Rotory mabey.. but if I got a Type 4 with upright cooling I'm curious about the factory alternator. I've got a sub from my old car I'd want in my SB a 12" Pioneer TS-W304C powered by a USX-2100 that's got a 35A blade fuse. (300 Watt) can the elecrical system handle something like that? I could sell it and get something smaller. Or do they make bigger alts?