McLeod's box will be out anytime now for Mopars. I emailed them and they said you need a Turbo 400 spline sized output yoke and fab a motor mount cross member. Otherwise should be a drop in if you currently have a manual trans, floor shift car.
Granted it's rated less (500ft/lbs) than the Passon (700ft/lbs)box but is also only $2800 -vs- $4k.
http://www.mcleodracing.com/index.p...mission/mcleod-racing-muscle-car-5-speed.html