Sign me up on the envious list. That's a fantastic buy at $150. Would've been a great buy at $500. Beautiful.
Mineral spirits or kerosene and some scrubbing will take the cosmoline off.
On the stripper clip function, make sure you've got everything out of the mag and receiver. Any chunks left in there, and old cosmoline can get almost petrified, can screw up the feeding.
Definitely look for a CMP match in your area. The guys shooting there can give you some great information and tips on your rifle.