Just judging by the shape and the shifter location, it looks like you'd still be doing a lot of cutting and patching, need a centered shifter location and the whole shift rail area is taller than an A-833.

Now, you also look at installing basically the chevy version and now you need a Mopar to muncie quicktime bellhousing, the aftermarket slave cylinder kits (which honestly I am not a fan of), and still need a GM clutch disk for the 23 spline...and you're on your own for the crossmember, which may also not clear the original torsion bar crossmember. Still buying a driveshaft with a C6 yoke.

I did the T56 Magnum conversion with the ToddRon crossmember, made my own floor with mostly a pre-fab 6-speed tunnel for a Chevelle, took out the aftermarket slave kit and went for a 2002 Camaro slave, driven it for two years and it's still amazing.

Other than the ToddRon crossmember which might actually be better for this also (or make your own slightly smaller version), you save what, $600 over a T56 Magnum on a Mopar? I'd just keep the T56 Magnum honestly.

I attached some pictures so you could see what that looks like. Of course I'm a go big or go home guy for this type of thing.

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'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip