carb
a 750 holley is not a favorite of mine I changed squitters, cams, jets, you name it. the only thing you can do is send it to a pro, it will work ok if you just drive it but if you want preformance when you floor it , it will hesitate,just to show I know what im talking about, turn your idle screws open to a point where it is gasing big time , like 3 to 4 rounds out and your hesitation will be gone, but you will stink up the garage and polute your oil, but it will show where the problem is and it cant be fixed without a pro getting into that carb, stop killing yourself , I have been there, I bought holley books and talked to every motor head i know and my problem was gone when i sold it and went to a 950. I suggest selling it and buying one from pro systems