In 1959 the 235 with the updraft carb is listed as the Thriftmaster Special.

The 1959 truck Thriftmaster engine had a new, lower lift camshaft; valve springs and new carburetor calibrations. The rocker shaft assembly was also redesigned.

135 horsepower at 4000 rpm
217 ft. lbs. of torque at 2000 rpm


-Tom

1950 Chevy 3100 w/ 1956 235