1986 Mazda B2200 Mazda B2200

I bought a mazda b2200 a few months ago and started it up, it will run but not very good, it blows blue smoke and does not have very high RPM's, I have replace the water pump, head gasket, put new plugs in and still the same problem, a rough idle at low rpm's. When it does run, when I took the EGR valve off it was packed with black sook so I cleaned it out and it made no difference. I dont know what is wrong with it. I like the site.