Replace rear main seal.

It drops all the oil in about 50 miles. It really sprays. I changed all gaskets except head gasket, and I also changed all of the vaccuum hoses

WOW!.... Then you obviously need to do something! Before you do....make sure that IS where it's leaking... cause it sounds more like a pressurized leak than a rear main seal. Good luck with it!!

It is a pressurized leak, and it's definitely coming from the bell housing, so the rear main seal seems like the best bet.

The only pressure in the crankcase is blow by from piston rings!!!! That's it, so you may want to look somewhere else! If the engine has that much blow by to force ALL the oil out by the tesr main seal (which I doubt) ....replace the engine!!

:-)