I'll second the suggestion of Fel-Pro gaskets. I'll go a step further, and suggest better than cheap replacement head bolts, and replacing both head gaskets if you intend to keep the truck. I'd not only check the heads for cracks, I'd have them surfaced, and at least have the valve stem seals replaced. I also suggest Permatex hi temp O2 safe RTV silicone. You cannot get parts too clean, gasket surfaces need to be clean and perfect. Torque the heads to 25, 50, and then 75, with oil under the heads of the bolts, Teflon sealer on the threads, and use a real torque wrench, not one of those cheap "wonder wands" they rent at the cheap parts house.