Rich, I've used this alternator mount from Speedway before in early Camaro/Nova subframes using the standard Delcotron alternators:
http://www.speedwaymotors.com/Small-...ain,35790.html
It clears with the 'short' crank pulley and can also be spaced forward to work the 'long' crank pulley. Fits the Camaro/Nova subframes very nicely. -Al