I have had loads of Holleys over the years, my son has had a few also, if not set up you can have problems.
As I said before, I wanted to keep the Quardajet on there for originality but I just had too many problems with it leaking.
Everyone I spoke to about it told me who to get to fix it but it still leaked so I gave up spending money on it.
Here is a picture of one of the leaking well plugs, whenever I switched the engine off the carby was draining down into the intake.
Well Plug Leak Close Up.jpg
Anyway, all sorted now, Holley Street Avenger on there & doing everything the way it is supposed to.
(It's on an adaptor plate even at the moment but have an Edelbrock 2101 intake manifold
sitting here on the top of the next things to be done list.)