It looks like the 261 was the standard engine on 1960 2WD C60 trucks (CLST60 or C60 LST)?
What is the model number (if any) for a 1960 C60 4 wheel drive truck?
And, what drive-train components were standard on a 1960 CLST60?
In 1960, the K10 and K20 (4WD) trucks were 4-wheel drive
(4-speed manual transmission, and standard Thriftmaster 235, or RPO V8 327)