650 speed demon vs 700 holley dp

Hey guys I am looking for some input on the 650 speed demon carb with vac secondaries. I have a 700 holley dp that I am sure is going to end up on this engine before it is over with.

The engine is a .030 340 with 11.1 compression. Has stock unported J heads and 1.88 intake valves and a victor 340 intake. Camshaft is a bullet 252 intake 253 exhaust @ .050 with .516 lift solid flat tappet and 108 lobe seperation. Cam is in @ 106. Will be running a four speed and 4.30 gears. 1 7/8 hooker headers and 2 1/2 exhaust. The car is a dodge dart.

This will be street drivin at times and raced also.

So what do you think the demon or the holley?

Is it true that demon carbs flow more than advertised?

Any problems with tunning the demon?

If I left out anything out as far as combo let me know thanks.