Max Power

Can anyone tell me what max rated engine size is on a 1988 v20 center console?? I recently purchased this boat with a 1992 Yamaha 200 hp.
Also, how will this boat handle in rough seas??
Last boat was 17 ft bay, so this thing seems huge, I don't want to overestimate how seaworthy it really is.
Great forum---thanks in advance.

PALE RIDER