Use at least 3/8" diameter x 0.120" wall pushrods.
Seems like alot of duration on the cam, but it sounds like the engine is going to rev over 7,000 RPM?
Make sure the heads have the long / deep thread inserts for the rocker shaft studs. On my first set of MW victors (early castings), I broke the center rocker shaft stand on both heads.
We modified the rocker stands by milling off the original stands and using the MW type rocker stand blocks which also allowed up to adjust the rocker shaft height.

My second set of MW Victors had longer thread inserts in the rocker stands which should be better, but not wanting to take chances, we converted that head over to use the billet aluminum MW style rocker shaft stand blocks.
Not sure if you already have the rocker arms, but now you can get a paired rocker 5/8" shaft rocker arm system that should be more stable (less flexing) than the single shaft rocker arm system.

Should make 700+ HP, but watch the High RPM power curve for valve train stability issues.