Re: Anyone here use the Quick Fuel Black Diamond Carb
No carburetor will be any good if you lack basic tuning skills. (info gleaned by your report of Holley's being prone to backfire)
In the case of your Edelbrock, it sounds like you just got lucky by bolting on a carb that happened to be close to your ideal setup.
Didn't want that to come off wrong, but it's been my experience.
I think in your scenario, you should find a friend that can get whatever carb setup for you and there is no reason it shouldn't hold it's tune for a few years.
1976 F100 390/c6
1963.5 Galaxie 446FE/c6