440 ,30 over bore, 509 cam, tube headers and a Torker intake waht kind of Holley carb will work well double pump or vacuum secondaries and how about cfm?

DP... 850 or 950 depending what you do with the car

Its a full body Challenger, 4 speed , 4.10 Dana just going to the track on a trailer nothing else.

Too soon to tell on the revs, I plan to hammer it but its just a 30 over 440 with flat top 10.5 TRW's with balanced crank rods and pistons so I don't know but maybe 6,000 rpms ,,,will see..

I use a Holley 750 DP on my 440,and the cam is the 296/557.Plenty of carb.I tried the 850 we have and it didn't run any faster.

I'll bet that a well prepped 750/780 vac will run as well as any DP you would try on that setup. It's a familiar test bed that I've done with three carbs in the past...780VS/750DP/850DP. No reference to my current SB drag Aspen, which also sports a modded 780 vac that works better than the DP.