So after some more cleaning, I ended taking another look at the Stampede cartridge and getting its new label attached.
The big issue is that the game would not play. I remember that one of the two cartridges wasn't working and simply never got to it. Tried it on my usual 7800 and took out my 2600 as well. It would not work. I tried another alcohol-based clean on the contacts with Q-tips and it wouldn't work.
So I gave in and opened the case. The contacts did look ver