Looks to be a 307 with 2 bar. Roc. Most of these had this setup.--next door neighbor has a 68 LB with this setup.
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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