So finally got back to actually working on the rig. I think I asked the question before but dont remember or cant find it. So I'll upload a short video on this but I have rear main and oil pan about to go on. I am uncertain on which I should first... 

Oil pan then rear main or vice versa...

 

 

 

Rear main seal housing, then oil pan, then the seal.   The pan gasket will come up to meet the seal housing.  Also, if any of the seal housing gasket is hanging below the housing after the housing is mounted to the block you can trim it before putting on the oil pan..  The other way is you have the seal housing sliding over the pan gasket.  

Awesome stuff man. I appreciate the help. I'll be doing this today/tomorrow. 

I'll do a video of the engine before it goes in to show it off.