Wow thats one awesome 63 Dodge ! Wonder who owns it ? I dont know how much you plan to race but so far I have raced my 63 six times at the track over the last 4 years and my 8-3/4 is still all stock other then the Detroit Locker I put in it. I just hope it holds up until I can get a Dana. But I plan to atleast put a good set of axles in it for now. As you can see I only race it once or twice a year and I know I am pushing my luck with the 8-3/4 running 10's at 3700 lbs so I am glad its an auto in my car. When I had the axles out a few years ago I was surprised how well they looked and they were not twisted at all. If your car is an auto and you only race once or twice a year you may get away with it for a few times out and yours is beefed up more then mine so your in better shape then i am with mine. I do want to go with a Dana as soon as I can afford one as I know if I blow the rear I will be pulling the trans also to fix the blown overrunning clutch (sprag). Ron