I added a 6" with 6" setback jackplate on my Javelin 367. I used a cherry picker type engine lift and it worked great. One problem I had was the steering cable came in at to tight of an angle and bound up the steering. To fix this we drilled a new hole in the splashwell, put a boot on it and ran the steering cable in that I was not planning on drilling a new hole in my boat but it came out ok.