Holley guru's- need advice

Are there any air holes in the butterfly's? For an 8 second car to be able to idle without some sort of band aid with this carb is amazing. Its not uncommon to enlarge the PVCR's behind the one powervalve, and to go with more emulsion holes in the carb metering blocks. The Proform body is what, about $100? That would be a good start before you put any more money besides a kit (which you'll use anyway) into that old carb. It may have radical pump cams and larger pumps too. I had an 850 off a big block "drag" car, got it in a deal and I started trying to detune it back to a 451 street carb. Well, same thing: things were drilled out, radiused, cut off, blended, thinned, vented, etc. The Carb shop (well known Holley gang) looked at it for about 10 seconds and gave it right back to me saying it was pretty much gone as a street carb, and even a race carb with all the hacks that were done with it. If you can do the machine work yourself, drilling and tapping for stock screw in bleeds (if it needs these) and emulsion holes, and replacing shooters and pump cams an diaphragms (~$18 a piece nowadays!) go for it, but that Proform is a great piece to start fresh with and it has all the proven legit hop ups already done to it. You may end up with a good baseplate (sans butterfly valves) and bowls..That is all I could salvage from that race carb. Good luck.