I have a very good friend that has done this to put a 96 Magnum in his 70 Duster.
He used a Magnum flywheel and had it machined down, then knocked the ring gear off his LA flywheel and had it pressed onto the cut down Magnum piece. Then had the flywheel drilled for the pressure plate.
One of the pressureplate holes gets slightly into the bottom of one of the timing notches but apparently had no effect cause it's been running just fine for 5 years.
This way he was able to keep the original bellhousing.
