Whats the best route to go for dual carbs?

Running thru the Holley sizing calculator I get the 1250 is the largest made, so I should consider dual carbs screen. Is this where some of my power may be lost?  
What is the best way to tackle this issue? 2 850's?
593 CI w/max 7500 rpm

Thanks

QFT has 1450 QFX series carbs.

Lem Evans wrote:QFT has 1450 QFX series carbs.

Thanks Lem. Just went and looked at them.
How do you think they would hold up in the off-road/sand in everything environment? Have you heard any bad about them?

Those are great carbs. Just run a good filter.

Lem Evans wrote:QFT has 1450 QFX series carbs.

Will this bolt right on in place of my 1250 Holley? Reading the specs can't flat out find the answer, a little vague

yes, unless you have a 4 hole spacer under the 1250 to match.

I've been using a QFX 1450 on my mud drag 604" C head combo since it was built, and can say it is the real deal, and you wouldn't be dissappointed if you went that route.

schmitty wrote:I've been using a QFX 1450 on my mud drag 604" C head combo since it was built, and can say it is the real deal, and you wouldn't be dissappointed if you went that route.

Ignore all those questions I just asked Scmitty ( except the important one)

Thanks!

For the displacement and RPM that 1400 cfm is even small Two 1250's would work well.

What is the intended use of the motor?

fatal addiction wrote:What is the intended use of the motor?

Trying to go 300' in 4.4ish seconds in a 4,200 lb Bronco. In sand. With up to 8 passengers. No bottle, NA gas.

bronco911 wrote:

fatal addiction wrote:What is the intended use of the motor?

Trying to go 300' in 4.4ish seconds in a 4,200 lb Bronco. In sand. With up to 8 passengers. No bottle, NA gas.

Going from previous bests of 4.80's to 4.40's, with no wieght changes? Gonna take more than a tunnel ram I'd bet. Time for the fast gas, or push air in it. I went from 5.80's to 5.1's with 160hp/100# NA power gain. But that was slow, easy to improve. The faster you go, the more work it takes to gain. I wonder what sort of power you'd be needing, 1100-1300? Similar vehicles (weight wise) seem to need that sort of power for what your wanting. Maybe those A-heads are something for you to think about.