I have a 1990 Lowe Model 1940V w/ a 70hp Johnson model VJ70TLESB, I would like to move up to 100hp or bigger,the boat is rated for a 120hp, I was told that the mounting bolts for a 120 are the same, if this is true, what yrs am I restricted to? also, will the OMC controls on the boat ie: steering & throttle match up?