To run what? There are headers out there for small and big block engines that fit decently well. TTI even makes headers for Gen 3 hemi's that work with torsion bars. Yes they're expensive, but cheap headers have more issues than just torsion bar and steering linkage clearance. And compared to a coil-over conversion they're cheap.
Header are pretty much always a PITA if you install them with the engine already in the car. Doesn't really matter what year, make or model. Sure some are definitely worse than others, but unless you've got an old truck with a giant engine bay they're a PITA. And I don't really see what the big deal is. Yes, it's a PITA, but it takes an afternoon and you do it once. I installed the headers on my Challenger over 60k miles ago. I've done nothing since then that required removing them. The headers on my Duster have been in the way more recently when I had to deal with a leak on my remote oil filter take off plate, but any header would have been in the way there, the torsion bars were of little consequence. And if you install the engine from the bottom on the K member you can usually just install them bolted right onto the engine.