Trying to figure out if I have two oil leaks or an oil and transmission leak on my 73 Duster 318

If you have a pressure washer, spray it down. Top to bottom. Anywhere you see oil. Engine degreaser first will also help. Then run it and check it again later. There's too much oil all over on your pictures to determine what is going on. Pull that inspection cover on that trans and clean inside too.

If after all this you still can't figure out where it's coming from, you'll have to start moving things out of the way to see where it's coming from. Might be something simple as an expansion plug on the back of the block. If it was me, I'd remove the trans to get a better look at it. Chances are you'll have to remove it anyway to make any repairs, so might as well get that hunk of metal out of the way.