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Sounds like you got the wrong balancer for you timing tab. Most later model engines (blue-305 & 350) had timing tab straight behind water pump. Timing mark on balancer was where you discribe. Low timing will cause a carb backfire . Just advance your time until it goes away and if it starts alright without drag leave it there.
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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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