Thanks to a number of Stovebolters, here is the complete answer for anyone who may encounter this problem in the future...
The correct alternator bracket is cast iron, and has cast number 3831195. This bracket will provide a more forward offset than the stamped, spot welded bracket probably found an a 230/250. Additionally, the OEM 292 uses a unique alternator pulley that has about an extra 1/2" of spacing forward from the alternator fan. If you do not have this pulley, and simply purchase a rebuilt OEM alternator from a local parts store (#7122 in my neighborhood), it will not come out of the box with the right pulley. A special note of thanks to Mr. Larry G. in Oakdale, CA for hooking me up with that pulley. Everything lines up perfectly now, with all OEM parts, just the way it rolled out of the Fremont plant on 9-15-65.
