You are looking at a pair of exhaust manifolds from a 66 Pontiac Tempest with 326. The left side is cast # 9779032. Right side is cast # 9779325. The numbers and date are not very legible. Correct for 66 to 68 GTO & 67 to 68 Firebird with 326, 350, 389 or 400. There is pitting but nothing serious. There are 2 snapped studs and the stud hole is on the edge of the flange. This looks like a casting flaw. Still usable if you use a nut and bolt.  Heat riser is free and spring still works. All mating surfaces are fine. There are no cracks. This is a good, usable pair of exhaust manifolds.