I have a 1977 16 ft. AMF Crestliner fiberglass hull,my 115 hp Mercury gave up the ghost. I have the chance to get a like new 50 hp Mercury 1971 vintage for a good price.My question is, will that size engine give me enought power to handle the boat,I dont care about pulling a tube or skier,all I want to do is go fishing and get back to the dock.Thanks