Tired of typing it out Michael is no longer making any centerlinks at this time. He is going thru some issues and when he has all his stuff set back up and running he will start making parts again.
Is it a lot of blow by huffing or alittle haze? I have a little hint most motors have a hint if you look at them puff out. So one that's been parked on the floor could have some more to it. Maybe try a video for us to see.
First thing will be to have block checked after cranks pulled if it did bust it. Then get the mains cleaned up if all checks out fine with the block if no little hair line cracks.
He did not say how much blow by is coming out of the pcv tube. Some coming out is normal on a higher milage truck hell mine does it now and since even new. He needs to worry if it ever blows the dip stick out or the oil fill cap off.
The gray smoke is most likely from your valve seals...
What about the nitto 555 zr
http://www.discounttiredirect.com/direct/tires/nitto/home.do?pap=t&s_kwcid=TC%7C18996%7Cnitto%20discount%20tires%7C%7CSM%7Cb%7C20477424327&gclid=CKf60K6l2LYCFQsy4AodI2UA7Q