Hey Magnus,
I am using Doug's headers and I REALLY like them. The fit is perfect. I coudn't be happier. I'm stoked! (no, I don't work for Doug's :-). They weren't cheap though. 530$ through Summit, # DOU D660YS for manual trans. 400$ without the ceramic coating but they'll rust eventually. The fit is tight and I did have to jack the engine out of it's mounts, shove it over to one side, then do the same with the other side, but once in they avoid every boss, mount, frame piece etc perfectly. And thanks for the props on my car, and good luck with your 63!

Jim.