transmission options and questions

I've installed a 545RFE in my 70 Duster, behind a 5.7. My motor is a bone stock 06 Wagnum take out, so I have no concerns about the 545 being up to the task. There are places that can make a 545 live behind gobs of torque and HP. The floor pan and torsion bar cross member will have to be hacked, but it's no big deal. If I were leaning towards a stick....it would hands down be a Jamie Passon 855 5 spd. :prayer: Good luck.