Good job!

Take note:
Oil separator has two passages leading downward into crankcase.
So, blowing into it successfully (air comes out the oil fill opening OK) only guarantees that at least one of the two is open. If you don't find oil seeping from any seals, then you can suppose that all is well. The two passages are set up differently; one receives incoming mist/vapor and the other returns droplets to the crankcase. For details see
http://www.brickboard.com/FAQ/700-900/EngineSealsBeltsVent.htm#Crankcase_Ventilation_A_Treatise

In my case, I still had leaks after servicing the upper flame trap system, so I removed the separator and insured that all passages were open. While in the area, I cleaned the throttle body, Idle Air Control, and the flexible "accordion" intake hose. Still had a rear main seal leak so I paid my shop to replace that seal. Problem solved.
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Sven: '89 245, IPD sways, electric rad. fan conversion, 28+ mpg - auto tranny. 850 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).