Yes, originally the mating surfaces were perfectly flat, unpitted, and rust free. But some 45 years later...
Folks determined to run as original will get the manifolds flycut a smidge. Me, I use gaskets and like them. If I were to go gasketless I'd have to cheat and use a very light smear of "Ultra Copper" RTV to assure a complete seal. I've spotted the telltale soot marks on a couple of concours type restorations where going gasketless was indeed 100% correct but unfortunately not 100% leakfree.