[Roadsters] The cross country discussion has me thinking...

[Ken & Tammy Williams]

Hey guys and gals.  The current discussion about driving across the country in
a roadster brought up a question.  Maybe showing my ignorance, but here goes.
I have always been hesitant to drive my '67 1600 for too long on the
interstate.  I've done it, but at 70-ish it is turning 3500 rpm or so.  Is
that okay???  I'm a little bit of a wimp maybe??  Definitely too little of a
mechanic to know for sure.
Thanks,
Ken