dreman,,,I ran the trip from El Paso to Pasadena, Tx. in 1973, in a little over 10 hrs.
I did this in a Gremlin X, with a warmed up 304 V8. Had headers and carburation, ignition and suspension upgrades. On the wide open I10, a guy runing next to me was clocking me at 137 mph. My speedo was way off BC of oversized tires. Got stoped between Kerrvile and San Antonio by DPS. Clocked at 110mph. Told him I just got out of the army. The fine was 80 in a 70, WHEW!! I even stoped for 30minites to say Hi to one of my aunts in San Antonio.
My folks where shock to see me pull up in the driveway so soon.
At sea level and bigger carb jets that Gremlin would run over 145.