360 question?

ijust purchased a quick fuel 780 cfm...figured I'd giver a go

I think you'll like it. Generally right out of the box their tuned pretty good but depending on how big your cam is you may have to put a lower rated power valve in it (you'd have to do that with most any carb you got, not just the quick fuel). You could probably call the place you got the engine from and ask them how much idle vacuum it pulled (your dyno sheet may say, but most don't). You want the power valve to be rated at approx. 60% of the idle vacuum. In other words if the engine pulls 11" of vacuum at idle you'd want a 6.5 power valve which I believe is the size they come with.