From the Rochester Master Sales and Service Manual

1972 Chevrolet truck:

2G - 7042123 (transmission not specified)
2G - 7042124 (transmission not specified - WITH GOVERNOR)
4MV - 7042910 - California A/T
4MV - 7042911 - California S/T
4MV - 7042210 - A/T
4MV - 7042211 - S/T
4MV - 7042208 (transmission not specified)

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop