Slant 6 Exhaust Manifold Washers

Slant-6 manifold stud/nut links are
here. Install the studs with Loctite № 542 or № 592 on the ends that go into the cylinder head.

It is very much worth your while to get the good gaskets for the manifolds-to-head and intake-to-exhaust junctions.

General manifold mount info is in this article.

Exhaust manifold selection info is here, and because the only exhaust manifolds now available are '73-up type, and the '73-up factory chokes aren't necessarily what you need (and they're poopy even if they're a match for the carb you're running) you'll want the electric choke info that's here.