Early 273 intake problems

If the 2bbl is good, nothing tells the motor its topped with a 2, it doesnt know until it starts wheezing at the top end. Heck. block off the secondaries (just pull clip on vacuum pod) of a 4bbl vacuum secondary carb. bingo, a 2bbl. a 500 cfm 2bbl is not the same as a 500cfm 4bbl in flow. They are measured using a different pressure drop. "The 500cfm 2bbl was equivalent to a 350-400cfm [email protected]" (4bbl spec) vac drop..."