20 Seafari i/o Engine?

[Ryank]

Has anyone ever done or heard of useing a 4.3 v6 as opposed to a 4 cyl in a 20 i/o? I was thinking it might be nice to have 225 horsies vs 140 without too much more weight? The 4.3 seem to be pretty abundant as people swap them out for v8's often and price is pretty good.