I was searching for more info on a 1973 Mercury Colony Park wagon and got to this site, that shows the Stock Options, including original Engine Displacement and Power rating: http://www.nadaguides.com/default.a...f=5013&m=1204&y=1973&c=7&da=1&vi=77335&d=4255 The thing is that if you didn't know it was an option on a car you're looking for as a Project, this place might help. And then it shows you the original selling price and the low/high in today's market.