Update: Returned to Cali a couple of weeks ago and truck didn't smoke as bad. Wife was following in her car and said she could smell strong diesel fuel smell most of the trip, especially on the down hills. Otherwise truck ran good as usual, 17mpg empty between Bend and Klamath Falls. Last weekend I did the ATF in fuel filter trick but was still waiting for Ferret tool to arrive to check timing. First tried repeating the 2000+ rpm with no load to see if it smoked like it did over Christmas. No smoke but strong smell of diesel in exhaust. I then did the ATF trick and let set overnight. Next day drove it to flush out of the system. Again, didn't smoke afterwards but still had a strong diesel fuel smell in exhaust. Today I checked the timing and looks like advance is only 4 deg not 8.5 per the manual. IP factory timing marks are aligned perfectly. Guess I'll have to make a bent wrench and adjust the IP timing so it is proper at 8.5 deg then test for smoke again. I'll post an update again after.