I'm fairly sure the 1955.2-60 GMC Master Parts Book only lists one adjustable jet assembly for the 1 barrel Zenith carb. Heading out to a graduation party in a few minutes, but I'll look it up when I get home.
Jeff: Where in Hays County? I'm about 10 miles mostly west of Fredericksburg.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| 
