You can search your door post Data Plate number
here...click... Type in that 6HPG number should come up with a manufacture date.
Also, how is the Data plate held on the door post? modern pop rivets, clutch head screws. Philips head screws?
This might tell you if the Data Plate has been changed.
At some point in your trucks history a state may have issued a vin number. That could explain the number on the title. Inspect your frame. There could be a plate or sticker attached by the state somewhere.
Check your cab mounts, if you have two rear cab mounts (shackles) its a 50, if you have 1 rear cab mount in the center it’s a not. (I’m not 100% positive about that test)
What size engine is in your truck?
do you have any pictures?
Good Luck
