Tune the carbs right for WOT and it'll be a screamer. You have the shorter stroke 3.31" to wind it up, then you use that cam? How high do you plan on winding this with that
hydraulic roller?
On my 360 build and it's 3.58" stroke, with 4.10 gears. I haven't even considered my converter yet, my Offy is the low rise version so the plenum will be smaller and my cam is a slightly bigger SFT.
Here are the carbs I plan on using:
Edelbrock 19049 Edelbrock AVS2 Series Carburetors | Summit Racing
I think you'll be fine with 2x500cfm and mechanical secondaries.
I suspect your issues will lie elsewhere... You may want to consider some STOUT valve springs.