(Newbe) 273 to a 340 and tremec 5speed swap.

TheCudaKid said

i have a 318 intake so i can put a 4 barrel carb on it, and i also have a 600 4 barrel that has been rebuild and long tube headers.

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What carb, Holley, Carter? What intake? Pictures, or numbers on the carb and intake? If I were you I'd ditch the headers and use the stock exhaust with the "67" 273 Factory high performance exhaust, nothing cooler.