If your not concerned with the stock appearance, you could buy a one wire alternator from Jegs or Summit. I think the 100 amp units are around $100. I just bought a polished Powermaster 100 amp alternator with internal reg for $129 that can be used as a 1 wire or 3 wire. I currently have it set up for the one wire, so I could remove the voltage reg. I got the polished one and I'm not to happy with the quality of the polished job, but Powermaster makes a good alternator.
1969 Camaro 350, Trickflow heads, ST-10 4spd, Hotchkis suspension, Baer SS brake kit, moser 12bolt