Overheating after Thermostat Change out

Installed a new Duralast Thermostat #15479 in my 1968 Plymouth Barracuda 318 5.2L

First time taking it out - High Heat (temp gauge 90%) almost 1 minute into the trip. Never overheated before this. I was just Updating parts due to this being the Original thermostat. :banghead:

The new Thermostat failed to say "Toward radiator" as the old ones did.
1. Is It possible I've installed it Backwards (Not Upside obviously)

Any suggestions will be greatly appreciated.

Now I'm a Noob forum and Mechanical wise. Please take it easy on me.
I'm just trying to keep my Grandpa's memory alive with his car