Head pipes mate with the manifold with no gaskets. Clean up the spherical surface the best you can. Get the studs and nuts from Ames Performance, no springs. In fact, get all your parts from Ames Performance. Get a set of manifold bolts from Ames. Exhaust manifolds are not all the same and some have different length bolts so make sure you get the right ones. They are hardened bolts.

Ames is in Spofford, NH near Keane. Not sure where you are. You can order parts and pick them up to save shipping. Maybe show up there with your manifolds and they will hook you up with the right bolts.