74 Valiant 318 Backfire when hot

ThatPolarBear11 said

It's ran like this since we got it, it came with that manifold and carb, and like I said it only backfires when warmed up

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Still doesn't mean that then PO timed it right or the carb isn't bad. Do my simple stuff first and MOPAROFFICIAL's manifold recommendation, then remove the valve covers and go deeper.