Help with chasing an oil leak

[Wills67]

Hey folks! I don't have a diagram or exploded view of the transmission, but wonder if anyone else has taken care of a leak like this. I have checked all the bolts, but still get a leak that seems to come from the top right cover bolt. Is this normal? Or is there an o-ring or gasket I need to change? Thanks for any inputs

 

[BBChopper]

I would check the fluid level first off then pull the bolt and see if it has a gasket or o-ring.