B3422w5 said

Missing head and cam info. But, assuming it’s a mild Eddie type deal with a semi typical 240 ish@ 50 solid camshaft…I would run the airgap, and not think twice.
better all around manifold for something with the above parameters, and the dinky vert screams airgap too.
I ran the airgap on a 360 with lots more cam and vert, and a bit less compression, and the airgap was a great fit, car ran impressively for what it was.
I doubt a Victor would run better on the street or strip in such a combo

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B3422w5 said

my 418 with a ported victor doesn’t 60 much if any better than my 360 did with same cam, heads and headers and carb. 360 had airgap

going down the track you are spending virtually all your time between 3800 and 6000 rpm( again assuming non offset head and moderate cam…OP never stated)
in that range of rpm, dual plane with be more responsive, 4 inch crank or not.. I had more vert and gear and still had the result I had
this again all assumes it isn’t a light, cut up car. Mine isn’t, doesn’t appear the OP’s is either

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