No physical difference in that they will interchange on the same mounts and bolt up to the same bell housing. Lots of subtle differences. Nozzle angle, prechamber dimensions, crank pulleys, front cover (hole for position sensor), oil pan and block (rear seal type), oil spray holes, bore size, valve size, intake bolt hole angle, and on and on. At the plant, nothing stays the same for long!
Fred482, I noticed you have mentioned the difference in intake bolt hole angle. I have a 6.5 turbo intake somewhere in my garage that I am keeping for a future project. Would this fit my '82 corse thread head?
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