Hello my fellow stovebolters!

So i finally got my 1951 truck running thanks to this forums help, Now i discovered that the main rear seal leaks.

So I ordered a new rope seal from the brand everybody reccomends (Best gasket).

Now i removed the gearbox, clutch and flywheel, and i now know how the thing looks at the back of the engine:

http://imageshack.com/f/f0M4G2gXj

My question is though, How should i continue? I've seen several "tutorials" online but none discribes this engine So i dont really know.

SHould i loosen and remove the two bolts you see in the picture? And try to take out the whole thing and then change the seals? If that is the case, do i have to empty the engine from oil?

Thanks a lot for the answers i'll get, cause i know you guys will help me fix this to! As usual!

Greetings from Sweden, Raoul.

Chevrolet 3100
Year: 1951
engine: inline 6 217CI
Transmission: Manual 3-Speed.
12Volt.