Inliners International Forums General Discussion Drive Train 235/261 transmission recommendations

I need some input as to what trans to put behind a 1959, 261. There is a lot of talk about the T5, 5 speed OD and the saginaw 4 speed OD. But I don't know if they fit the newer 250/292 or the older 235/261 blocks or both ??? Is the sagingaw a 4 speed with 4th/OD? What bolts up to my 261 stock housing? I do want to stay away from an automatic. The 261 is not going into a truck but will be in a light body roadster like a 29 or 32 and will see a lot of highway use.