Just for fun I priced a new Richmond 5-speed and on the Summit site it costs over $4100.00 without the shifter,add about $500.00 for a good shifter and linkage.Now you will need a T400 yoke and a longer driveshaft,custom make your crossmember and mount,whack a huge hole in your floor,cut and box your torsion crossmember...Or you can just bolt in a trans that will equal or surpass the strength of the Richmond box.
Gus