I have just purchased a 1985 glassply listed as a 19 ft. but atcually a 17 ft. with an extended transom with the engine mounted 2 ft. behind the transom.this is very similar to the whaler drive used by boston whalers in the mid 80s. Does anybody know anything about these hulls? It is all open with a center console. It came with a 70 h.p. yamaha but i would like to upgrade to at least a 90 h.p. perhaps a 115. the hull is rated for a 120 max.Would a 115 be too much?