Due to the acceptance of modifications in Pantera-land, you'll find every Pantera is different. And depending on the seats and steering wheel, you'll find that each one fits differently. Look at and drive as many different cars as you can and you'll form your own opinion/expectation of what the right car will feel like.
As for reliability, it's a Mustang engine! No less reliable. If the car has had common upgrades - correct or upgraded radiator, correct thermostat, etc. you shouldn't have any cooling problems.
Actually, the car is surprisingly practical. I drove mine daily for the first 4-5 years I owned it, until I spun a rod bearing.
Check out my website to learn more about my adventure.