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If you need it to put out high current for any period of time, make sure the regulator, rectifiers, and heatsinking are up to the task. Many of us consider the 6G alternator to be at it's limit with stock output. Merely upping the windings is recipe for problems.
Rectifiers, by design, generate heat. The higher the output, the more heat they generate. Most modern alternators are getting too physically small to provide effective heat dissipation at high output levels. Plus under-hood temps tend to be higher. All in all, a very iffy environment for the poor guys. Excessive heat is far and away the number one killer of electronic components.
I really like the idea of using external rectifiers for continuous high output situations, like the "Quicktifier" these guys sell. And mount it somewhere it can get decent cool air supply.