m y friend installed a richmond 5 speed in a 71 challenger convert with a 604 hemi about 1998.
it was a feature car in Mopar collectors guide in may 2000.
we had to do a fair amount of cutting and welding ti install it.

i have a T56 magnum xl 6 speed trans in my supercharged 800rwhp 08 bullitt mustang.
the shifting differences are night and day between the 2.