not even close to correct.Not a nickels worth of difference between the air-gap and RPM or the Victor jr. in the overall scheme of things. Not enough to "feel" anyway...(on the butt-o-meter scale)
That leaves...which one looks the coolest when I raise my hood!? Single plane Victor gets my vote for that.
Unless you abandon the...."no-hole-in-da-hood-theme". Then spring for a tunnel ram.
PS...Keep in mind on the cam.....tight LSA(107-110*) gives killer torque at the expense of lower(er) vacuum and slight drop in fuel mileage. With 427 cubes...you AIN'T worried too much about fuel mileage. Don't be afraid of tight LSA's and plenty of duration!
You have...1. light weight
2. big cubic inches
3. good stiff gears
in your favor.
Put a nice size cam in it and worry about rear tires!