340 carburetor selection advice

Holley 750DP

I ran it on a 11.3Scr alloy-headed 367/A833/3.55 with a 292/292/108cam
Yes with holes drilled in the primary throttle valves. One in each, 6or7/64ths IIRC. 14* initial. 700/750idle. My 292 measured 248@050. After three intakes, and three carbs, I settled on the 750DP/AirGap. I always like to say; once you've run a DP, you'll never go back. I once gave some church friends a ride, the 4 of us had to be 1000 pounds. That cam with that weight, had a heckuva 1-2 punch! They giggled like school-girls.

My 3650#DD-me in it, didn't like the meager 9.44 starter gear; but 3.55s is all I wanted to run, since I live in the country about 25/30 minutes from work.
Between the too-small starter gear, the high cruise-rpm, and the atrocious fuel-economy, I had to make a decision; after just a few months, I pulled it.

In it's place, I put a 223/230/110 cam and she promptly ripped off a 106 Quarter at 12.9 on 245/60-14 street tires. My favorite combo in that car. I'd still be running it, if the lobes hadda stayed on the cam.