Really?
Cruise speed is a lot slower than 350mph ias.
In fact, I just tested the F4U-1D vs the Spit16 in zoom climbs offline. I dove both down to 100' asl, when they decelerated to 400mph ias, I engaged auto-climb on speed set to 100mph (both aircraft had WEP engaged, 50% fuel). Once the aircraft reached maximum pitch (near vertical), I engaged auto-climb on angle. The idea here is that since the autopilot is controlling the aircraft, its inputs will be exactly the same.
The Spit16 zoomed to 6,500ft.
The F4U-1D zoomed to 6,000ft.
So, even at speeds that can only be reached as the result of a dive, the Spit16 out zoom-climbs the F4U-1D.