I have a 1998 Javelin 369B with a 1998 Johnson v4 with a 14 1/2 X 22 raker 3 blade prop, with a wide open throttle rpm of 5800rpm. I have a chance on buying a 6" manual TH pro-high jacker jackplate and i was wondering if anyone could tell me
the boat is 17feet6"long.
The boat right now comes out of water really well and does 57mph on gps

1. How much it would change my wide open throttle rpm?
2. Which way would my rpm go- up or down?
3. What prop to put on after jackplate is installed? (to bring rpm back to 5800rpm)
4. With it set up correctly (jackplate and propped) what do you think top mph would be?