You'll be fine with changing nothing. 90 amps max is fine for an output if you don't have a system.
The PCM is always turning the alt up and down anyways it's not like it's 0 amps and then max 90. It Fluctuates continously.
Idle is really the only problem, it's an under drive and the pulley is spinning slower the alt cannot put as much (in your case 14%) since really it doesn't matter what rpm your at over 2k rpm you really won't notice because it isnt going to yield more power since the alt is Changing duty cycle all the time and rarely would one need serious amperage unless you have huge amperage consumers like a system.
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