[John S Peterson]

Best thing to at this point is to take it back apart while very carefully paying attention to every nut and bolt and part used in this assembly. Sounds crazy, but I,ve seen flexplates put in backwards, junk on the crankshaft not allowing the flexplate to seat properly, and that's a few items..but if we don't take the time to carefully inspect upon dissassembly because we say "hey I checked everything it can't be that [i]thingy [i]but we are so busy looking at teeth or whatever, we missed the probably small reason why.
Remember that 5.0 doesn't know it's in a Cobra.....so why should the starter work any different than in a 5.0 with a C-4 in a Mustang or ?
John.....