I am sure that you will get lots of answers to this but I want to make one point. You say put the 396 back in it. That woudld be great only if you still have the actual 396 motor that came out it! Otherwise I think the value of it is higher with the 427 in it.
It may not be a "Motion" built car but it is documented and that is worth a lot in the collector car world. some day there will be a higher value on Survior unrestorded cars than frame offs.
Only you, can be the judge of what condition it actually is in. Sounds like you have a neat piece of history there. Give it a good home.
Good Luck which ever way you go....
