How much trouble is it to add a jack plate to a 15.4 shallow V bassboat the boat is a 1540 procraft boat 85 Hp Force engine?How much setback do i need 6,8,10 inch? As is motor cav plate is 1 inch above pad on boat top speed is 36 mph by gps at 5000 rpm running a michigan wheel 13.5x17p prop<br...