I've always used plain, old manifold gaskets. Slather the paper side with anti-seize & lock'em down.
15 years with the used headers on the 250, in the wrecker. Not 1 leak, except the collector gaskets, which I replaced with steel donuts.
5 years in my 94 GMC, with Edelbrock tubular manifolds(shorty headers). Only 1 leak on a back bolt that was hard to reach.
No special bolts, locks, gaskets, or nothing.