It will work and it will have the power to start up even new engines. In my own opinion, as I have said in other starterbox threads, the best starter box design for me is the one where the entire platform moves downwards and thats when the flywheel meets the motor. I have seen too many problems with the type of starterbox where the just back of the car sits on a very small platform.
With proper time to start up an engine you wont have any trouble with the small platform type... But if your pitman is restarting your engine during a main, trust me, the fastest is the complete platform type.