According to the manufacturer's information; both Rochester and Carter were used on the 250 in 1967 as original equipment.
The 4375s was used only on standard tranmission federal trucks.
Federal trucks with automatic transmission used 4376s.
There were also two different Carters for use on California only trucks.
Did Chevrolet use different linkage for Carter versus Rochester? I do not have this information.
Since the 4375s was used as original equipment on the 1967 250 with standard transmission on a federal truck, one would think that it would bolt directly on with no issues (unless Chevrolet did use different linkage).
One comment about issues with Carter and/or Rochester: Carter made some dogs, specifically the models BBR, AS, and RBS. Not all Carters are wonderful designs. Rochester made some really great carburetors, specifically Q-Jets (after 1967), and the 2G (2-barrel) and 4G (4-barrel) carbs. But as in any manufactured product, there will be some good and some bad. The are some individuals that have had no issues with the Rochester B's, and others that have had issues with the Q-Jets. But if one looks at the overall averages (and I have been doing carburetors for 60 years, so some experience) one comes to a conclusion as to the probability of success with a given model.
Jon.
