I've finally got plates and registration on the truck (woohoo!
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This is what the DPS site it states...
The exhaust emission system was installed by manufacturers of motor vehicles beginning with model year 1968. The inspection of the exhaust emission system will apply only to those vehicles that are equipped with such a system. The following exhaust emission systems will be inspected if installed as original equipment by the manufacturer: thermostatic air cleaner, exhaust gas recirculation system, positive crankcase ventilation system, air injection system, evaporative emission system, and/or catalytic converter.
BTW i'm in far north west Houston in Cypress if you know of a "friendly" inspection place.
Thanks