Easy enough to measure...from center of gunwale to center of steering helm, then from center of gunwale to center of motor, then down the gunwale from helm to front of engine...add the three measurements and yer there...several years back I changed my old '74 and it took a 17' NFS and did not require an engine lift...but keep in mind the splashwells in yours and mine are quite different...good luck and don't forget the pics...
