Ken,
Have you considered the 89MM 4 speed? It's the same one that myself, Tony, chuckthetruck (Stovebolt page) are running - that has the .73 4th gear. As you already know I have it behind my 292 and I love it. It fits perfectly and takes a good bit of torque. I have an 11 inch clutch too.
I believe that T5 will work fine. Just make sure there's room for that enormous 292 flywheel. You probably have the 3 dowel pin, 1/2 inch bolt crank. Have you checked for flywheel clearance?
-magic mike-
