B engine alternator bracket........

what was the outcome... did the brkt you bought fit?

I just ran into a similar issue, my 383 is a 66 and the pump housing is different than the newer 383s. The upper most alt hole is directly below the T stat housing almost centered and is 6.25 away from the lower hole and the 383 hole in the brkt.

View attachment 1716422895

For the 1962-1966 big block water pump housing, a different bracket with longer reach for the higher bolt hole was used. The following image shows this bracket on my 440 which is using an early Direct Connection aluminum water pump housing which has the same mount:
PXL_20250627_022311709.jpg
The bracket I used here is an original from a 1966 361. This is the non-air conditioning bracket. The turquoise colored bracket in the earlier pictures looks to be this one too. It can be identified by the longer "arm", and it has no hole in the middle for temperature sensor access.

The bracket is apparently available from several vendors, but it looks to only be part of the entire kit of brackets/bolts/sleeves where I looked.

Dante's has it in a kit at DMPS-7301-7 Mopar Alternator Bracket Kit - 1966 & earlier Big Block without A/C - dantesparts.com.

NOTE: To use the upper hole in the bracket on a B-engine, such as the 383, the bracket shown in the following image was added to the head:
Screenshot 2025-06-26 11.17.36 PM.png