High output alternator for GM 5.7 350

[FML 10+ year member]

Looking for a HO alt for a 98 GMC SIERRA K1500. HEARD ALTS THAT FIT IN THE 89-98 AND MAYBE EARLY 2000'S may fit.

 

Id consider a lightly used one. But im having trouble finding one new for under or around $300.

 

Have seen some on eBay for as low as $150, but don't know if thats a good quality.

 

I know little on the application. First time upgrading it. Planning on running around 2500 watts RMS, plus the vehicles power draw included, im thinking 250 amps?

 

Any input or advice would be appreciated too.

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