One more thing would be the door handles, '50 had turn downs and '54 has push button. Like wilbur stated about the latches. Its just a little sheet metal work to change the latch opening and holes for the handle.
"If it ain't broke, I haven't gotten ahold of it yet!" '51 Chevy 1/2 Ton 5 window '55 Chevy 210 wagon '75 Chevy C10 '84 S10 Blazer '85 K5 Blazer '01 Monte Carlo SS One VERY understanding wife http://community.webshots.com/user/51rustbucket