This page has dimensions for some of the various T-5 versions. The gearshift lever really moves around.
http://www.ddperformance.com/images/t5dia.jpg The Mustang version of the T-5 has a manual available her.
http://www.allfordmustangs.com/techarticles/t5rebuildmanual.pdf I guess you've been to the Inliners webpage... their chart stops at 1986.
I know some of the units were on multiple engines, but will the "L4 only" be strong enough?
Good Luck,
Kurt Chandler
first timer, soon to have '39 Chev 1 1/2 ton