Ok you Slickraft owners please chime in. I purchased a "1973" 21ft. V birth in great shape but in need of repowering. mercruiser "888" model with ford 302. Is this a brand of boat that will go the distance? Has anyone had any brand specific problems I should know about? In the bow of this boat in the birth there appears to be a factory built-in triangle shaped tank in fiberglass with a fiberglass tube sticking out about 1 1/4" dia. and a plastic barb fitting also sticking out about 1/2" dia. What is this?