Carb recommendation 440
Is your intake a 4500 flange or a 4150?
I would NEVER run a vac secondary again.
In your case I'd make sure I ran the correct flange carb or a FI system.
I'd check your timing curve. That setup should not be sluggish. The fuel may be in part due to the 4:11's and no OD. I don't know how you tolerate that.
My personal setup is 440, 4.56 gear with GVOD, 3500 vert, 950 mech proform 4150, 17/35 timing.