Tough, if it was a clone Auto a drag car would be awesome, could always make a clone drag 4-speed car, won't do as well but it will be fun to drive. I voted for 72 as these cars are getting hard to find. The last thing you want is to kick yourself over this deal in years to come.....
Oh, Round taillights are pretty nice.
BOTH would be my answer but thats obviously not an answer.