Your VIN decodes as a 1966 conventional cab 60 series cab & chassis with 157" wheelbase. That would be a nominal 2-ton with 19500# GVWR. There should be a GVW plate on the truck.

The 292 was the only inline originally available in the '66 60 series trucks. If you would like to further verify what the engine is, look for the serial number stamped on a pad just aft of the distributor.


Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"