Carburetor choice

The one you already have I think was the consensus.

But as for me, it's hard to beat a 750DP for ultimate power and ease of tuning the basics. But it is as good as impossible for me to achieve any fuel-economy with them. or any Holley really; they seem to all be quite rich on the low-speed circuits. Well ,maybe just the old ones that I am used to seeing.

If you need the cruising-economy, a metering rod carb is hard to beat, but they don't work all that well on a big-cammed engine.

The ideal carb set-up is probably a 6-pac, but consider the expense!

For you; a spreadbore is probably as close to ideal as it can get. Consider the Goggle-valved Demon, but ideally you would install it on a matching intake.