Transmission Numbers

I went and took a look at it and took some pics.

The number on the tailhousing is 3681191(red circle), which is still not in the trans guide but close to numbers for a 73 transmission. There are some numbers on the other side of the boxes (green circle), I think it starts with 73 but I can't read anything else(another reason I think it was painted). Also this pic is flipped 180 degrees so the numbers are right side up instead of upside down as on the transmission.

Also if you know what any other markings are in the pics feel free to let me know.

Thanks