How much HP are you looking to make first off?
Those heads will not work with a out of the box rpm manifold and a 750 Q jet Carb will be a restriction in and of itself on a 428 or larger motor above 5400 rpm with theses heads dependant on how it's Camed.
The flow level of the out of the box heads will overwhelm that rpm Intake manifold and even worse the limiting HP factor of that it will narrow up on the motors power band and make that band more peaky!
A Victor or similar Intake is the only way to go, and to use such the car needs the gearing for it, and once your into the Victor manifold your Q jet can not be used .
You did not post much info, but I think your looking to bolt on way too much head for the way your car is set up right now to make full use of it
Also if you have D port headers now your into a real good chunk of money stepping into the needed round ports!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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