A car like that is something you just have to learn for yourself.
It easy to have an unrealistic perspective of an old car until you learn what it is.
They will surprise you if you take the time to clean and oil them up.
Cars were more reliable back then than most people realize because they haven't
been around them.
I have never had a small block mopar or 904 that was any more reliable than an old
flathead six or manual three speed. Quite the opposite.
Now if your concern was speed rather than durable your take is valid.
Don't short change the car thinking you will be under the hood every
few miles because it is old.
You can have those kind of problems but it would be from not repairing it proper.
Glad you got some DQ trips in mind for the old car and fella.