The 75-76's are pretty much common, and the 77-78's are pretty much the same (in regards to bumpers, some interior stuff, some electrical stuff, and other misc stuff). I personally prefer the '77 (I've had all of the above at one time or another). Just a matter of taste. BUT I'd go for the one with the least amount of rust, and the least amount of previous owner damage (i.e. wires hacked for whatever reason).