You go to the wrecking yard, buy an alternator bracket from a 22re and bolt it onto your 22r block. then you have to swap out the plug on the harness. Its easy.
I'm doing this in the next two weeks.
Broadway Auto Electric in So Cal. offers a Double wound Stator for a 22re alternator, approximately 90 to 100 amps.
$150 for the kit
$200 for the built unit.