+1 for "Take it". (What did you really expect on an enthusiast BBS, eh?
)
But it's right - why do you own the car? It was built to be driven... I can respect not wanting to do the daily commute in it, but if your wife's into the car/the idea and the car's in good shape (both questions are potential deal-breakers), why wouldn't you?
It's a vehicle - it might break down, it might not - but most of the cars I've seen on recovery trucks look almost new to me...
Just make sure any service items (tires, brakes, oilchange, plugs/cap/rotor, valves, filters, wipers/washers etc) are in good order, take a few tools and the kind of spares you probably carry anyway (fanbelt, bulbs, fuses, relays) - but don't go too mad.
You'll probably find after getting it up to operating temperature and keeping it there for hours on end that it has never run better the whole time you've owned it - and that the effect lasts for weeks afterwards. I know the Porsche's I've owned have all loved 800+ mile trips, they eat them up.
They prefer 2500+ mile round trips, but they'll settle for what they can get..
Watch the temp gauge on long hills or very hot conditions, don't let it overheat, slog or cane it (too much) and you should be just fine.
Riding 40 year old british or yank motorcycles long-distance - now that's foolhardy. But it's still not guaranteed that you'll break down. I'd drive a good-condition Porsche that wasn't overdue for servicing cross-country at the drop of a hat, in comparison...