I have a 19-6. Last year I raised the console 8" and moved if forward by a few inches. It's a pretty easy matter. You just need to be careful now the harnesses, steering gear, and fuel lines drop into the trough leading aft. I have hydraulic steering, so that was no problem. And if you're moving everything aft, the the lengths should be OK.
This will also be a good time to check out your fuel tank. My stock aluminum tank was full of holes . . . which is why I did the project in the first place, haha!
Btw, I have a Honda 90 4-Stroke on mine. Only good for 30mph tops, but a real tractor in a variety of loads and conditions.