1976 23 Sceptre I/O repower?

[bherlong]

New to the board here. Have searched and found answers to many questions! What a great source of info!! My question regards a 1976 23 Sceptre I/O. I would like to put twin 140 hp Suzuki four strokes on a bracket on her. However, before proceeding I am open to other comments or experiences. If necessary, I will leave the I/O and simply replace with all new (but I love the four strokes), OR maybe a single 250 hp Suzuki four stroke on a bracket. Would like to venture up to 40nm offshore, and take frequent trips to the Bahamas from FL (about 70nm across from Stuart, less from further S). I am perfectly happy w/ 25kt cruise. I am a die hard fisherman and prefer trolling in blue water. Any advice on this important decision is appreciated! Thanks!