Hey most of my driving is freeway in the summer in +30degrees at 100kph and it stays cool, even when it gets bumper to bumper. I made sure the cooling system was 100% at rebuild and I added a heater core as an auxiliary radiator. 82 C in winter and about 93 C in summer without a hiccup. I don't personally have an issue with not having aircon an open window does me just fine. I tend to drive it less in the winter, more for the point that the vast majority of Perth drivers are useless and I don't want one spearing into the back of me on wet roads.
Just another point, it has been said a few times in various posts, but do not put inertia reel seat belts in the front seats as a replacement for the original lap sash belts as the B pillars are not reinforced to take the extra load that inertias transfer.
With any car you need to make sure that all systems are running well, as long as you keep on top of things and service regularly and replace components in a timely manner you will be fine.
One thing that I would fit is electronic ignition, I have it on my daily and I must say the convienience of not having to worry about points is great.
Take your time, and find the best one you can and, of course, put the pics up.
Cheers,
Gig