The 265 V-8 was not available in Advance-Design Chevrolet trucks (that series ended in mid 1955).

Here are photos of 1954 and 1955-1st series Advance-Design trucks.

Here are photos of 1955-2nd series Task Force trucks.

There were no 3200 Advance-Design trucks. There were 3200 (1/2 ton long-bed) Task Force trucks.