Jon H's website says 7027125.
1966 Chevrolet truck 327
Here are pictures of one that sold on ebay for less than $70.
It looks like manual choke parts are in place.
The casting looks like it is automatic choke capable.

Maybe the original manual choke parts can be repaired? Pictures?
Attachments
Rochester 4G-01.jpg (106.28 KB, 93 downloads)
Rochester 4G-02.jpg (99.28 KB, 93 downloads)
Rochester 4G-03.jpg (90.83 KB, 93 downloads)


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."