Bores:
1-1/2" = 235
1-11/16" = 261
1-3/4" = 292

5140 on the flange would be the throttle body for tag number 7005140 for 261 engine.
Heads-up on rebuilding. There is a ton of info on this website for rehabilitating the B.
What to do for warping. The weak link can be the power piston and wear. Float needs to be set lower than spec.
Fingers crossed, the result MAY give you a driver quality carburetor.
Ebay fetches top dollar on a 261 carburetor for a restoration truck.

"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."