Is your carb a Q-jet?? I don't know if Edelbrock makes a 750 performer series.
I have the 1902, 750cfm Q-jet
It isn't the cleanest thing in the world, but I don't have any leaks that are noticable. You can buy a set of five Air Horn gaskets from Edelbrock (through summmit) for about $10.00. (Mine are backordered).
After opening it you must inspect a few things. First see is the counter-weight on the rear (front of carb) of the float is still 'hooked' onto the float. It is an iffy mating, and Might find its way loose.
You can then check the float for a hole. IF you are gonna do this and haven't done it before, post again and I'll give ya some for-warning. I have done this three times in the past two weeks. I might use a blindfold next time
What is your motor/tranny setup? Just curious
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have now>>>>> am building
2.73 open 10bolt>>>>>>3.73 posi 12bolt
350>>>>396 w/nitrous
shooting for 12s in 1/4
college student budget!