The dual plane vs single plane is very true but has its limitations that the aftermarket simply describes as the operating rpm band in which they work in. It isn’t false, but it is a rule that can be bent and sometimes real easy, as in your case, the use of an dual plane intake designed a very long time ago for an engine that is an easy 48 to 68 cubic inches smaller.
This is why YR said to ignore the rpm thing. Your pulling more air and fuel in per cylinder stroke at a much greater rate than the OE sized engines.
The dual planes help torque production due to its long runners. This is why tunnel rams owners love there intakes. Ask around, you’ll see. The bends in the runners do not help anything but hood clearance.
Is this a Dedicated race car?
The car is super heavy for an A body race car. It could really use a 500lbs. diet.
