I had A 64 cyclone for a couple of years---289 4 speed--used to race it down at Pheonix city alabama during the race wars(civil disobience) period around Montgomery and Selma while I was in Army at Ft Benning Ga---

An alternative to the straight axle----you can lengthen the front spindle height above the spindle stub to raise the front of the car and run a piece of 2-21/2 angle from front eye of rear spring forward about a foot or so to mount traction bars to--or build a cross member there for the old super tock type niner rear-----------or set the rears forward that amount almost to rear edge of door frame and move front suspension forward keeping wheel base stock-------or----------and then maybe you would need to put brackets on the front for a tow bar--------------