John,
I put a 140 4 stroke Suzuki on my 1976 19-6 last year, and it is a dream. The boat sits a little lower in the water but it still self bails. This motor and size was recommended to me by Tommy of Hammerhead. Good luck.
Katherine
x2!! I <3 my zuke.
To be fair- these boats were never very good at self bailing. When I had the 90HP 2stroke, if I stood in the stern alone, the scuppers would submerge and water would flow in.
With the zuke, if I stand anywhere forward of the console, the scuppers are no longer in the water. So it still kind of self bails, it's just doing a slightly worse job at it than it did with the lighter 2 stroke.
Just get some ping pong ball style scuppers- It'll be fine.