[justcuz]

I really can't figure out why GM did not make the 67-72 Suburban's 4 doors. Internationals Travelall had been a 4 door since the redesign in 1961 and the Jeep Wagoner was a 4 door since its introduction also. I suppose GM thought it was a safety feature to load everyone behind the front seat from the curb side. Then again GM's station wagons all had 4 doors even going back to the woodie body style. GM and Jeep did build 2 door wagons, but were eventually eliminated due to the lack of convenience that a 4 door provides.

Your Tahoe link still does not work, does it describe why it won't pass smog?
If it was originally a 49 state vehicle California cannot make you install anything other than 49 state smog stuff on it, so what's missing, the cat?