[i82much]

I've had good luck so far with a NAPA reman 10SI, and I don't remember it being that expensive. Voltage is dead-steady 14 v at the gauge at a high idle (1000 rpm) b/c of the solid roller cam. I'd take your old one in to your local parts store and try and find a 10SI with the same clock position, I think they are 94 amps.

Disclaimer: My reman has only a year or so of limited runtime. HWYSTR455 probably knows an ass-ton more than I do about this, but if budget is a concern I'd give a reman 10SI a shot.

[Nicks67GTO]

So I checked out the Powermaster unit. Its a 140 amp Unit. If I upgraded to this part, don't I need to upsize the wiring? I've got a newer M&H engine harness.

[PontGuy]

I went through big alternator problems with my TA last year and learned more than I ever want to know about them.

A generic 10SI from a local parts house will work for a basic car if you manage to get a good one. But I gave up after trying two of them and upgraded to a 94A 12SI Delco remanufactured alternator. According to the Delco tech site it has the most low RPM amps of any of the original-design early alternators. Problem solved, with overkill. And less than $100 purchased off the internet.

If you are really going to put a huge load on it then you will need to go with a later alternator or one of the aftermarket versions like a Powermaster. And also consider wiring upgrades as already mentioned.

I found this link very helpful: http://www.acdelcotechconnect.com/html/tas_alt_12si.jsp