I hope I can explain this clearly. I live in area where the state lakes (PA) are limited to 18 HP, while most federal waters are unlimited HP. I presently have '94 Merc on my pontoon boat with Quicksilver controls, etc. I 'inherited' a '79 Merc/70 HP with the boat. Previous owner claims the unit runs well but has trouble shifting. I'm having that checked out. <br /><br />My question involves how complicated will it become to swicth these motors back and forth when going to the various lakes? The labor doesn't scare me, it's the controls and connections I'm concerned about.<br /><br />PS: It's my understanding the 70HP unit was on this boat within the past two years. It was supposed to have been deinstalled last summer(2002).