Go with an Edelbrock/ AFB carb for sure. I cant count the number of those things Ive planted on small blocks over the years. they will drive great out of the box , but if you want to fidget a bit you can get great fuel mileage AND great power out of the same carb. I wouldnt own a holly on a street vehicle too many headaches If you still had the stock manifold, it might be worth the fuss going through the q jet but for as high as the learning curve is on those things, youd be cash and sanity ahead to just get an Edelbrock.
It sounds like you are running an open single plane manifold. If you want it to behave better on the street and not waste fuel , if it didnt come with a removable divider plate to slide in there ( if it did, go find the thing and slide it in ), grab a chunk of 1/4" aluminum plate and poke wet rags down the runners to catck filings, then grind out a notch front and rear dead center just wide enough to hold the plate tight if you slide it down in there, then cut the plate to fit the contour of the inside and grind a little into the bottom to keep it from wandering . clean it all up and set that thing in before mounting your new carb and you will improve your low end street performance and fuel mileage