Driving on the freeway

[Wiggles]

Hey guys!

I recently picked up a 52 f1 pickup with the original flathead and 3speed column shift which had been sitting for a long time. After rebuilding the usual stuff its now roadworthy and is running better and better as I drive it around the neighborhood. Gradually driving it further and further from home over the last few days I finally ventured out onto the freeway this morning. She rides surprisingly smooth out there! My dumb question is- What freeway speeds are yalls driving? I didn't want to push it past 50-ish but wondering if regular sustained driving in the 55-65mph range perfectly normal with these old machines or damaging to the motor?

Thanks and apologies for the long winded post!

Jeff