i had a quadrajet on my 383 engine and it pulled like hell. i than got a 3310 holley 780 carburetor with 72 and 76 jets. it did not pull hard at all compared to the quadrajet. i than upped the jets to 76 primary and 82 secondary and no black smoke or anything it feels better but still doesnt feel nearly like the quadrajet did. also i no for a fact the secondarys are fully opening on the holley. what do you guys think?