OK I googled it. Built for GMC 2 1/2 T 1952-1960. 6 cylinder. Had electric fuel pump. Civilian 302 had a mechanical fuel pump. All I can say now is I would never have thought to, or would I ever, make a hole in a block for a fuel pump. If I tried that and made a mistake, I would close it up, use the WW carb, use an electric fuel pump with 4-5 PSI and go back in the house.
I could not find 302 info. The 60-66 GMC 305 V6 uses a WW carb and the pump delivers 4-6 PSI.
The 302 used:
Holley AA-1 (2 barrel)
Holley 885-FFG (2 barrel)
Stromberg WW (2 barrel)
Zenith 63AW14 (1 barrel updraft)
Zenith 63AW12 (1 barrel updraft)
Jon.