Stop in for a cup of coffee

Well, it would be a stress test for sure and would certainly let you know where the weak spots are!

Maybe try a more local 300 mile run first...
I drove it with 3:55 gears from vista to Fontana to run it at the strip. Could not pass tech, no roll bar...Drove it back. Just over a tank of gas, 76 miles one way. Now it has 3:23 gears. No issue except a weeping T-stat housing. Repaired that.