Source for engine hardware?
I think I know what you're asking, and this won't be much help, but I'm pretty sure Mancini sells engine bolt kits as well. Also check out Totally Stainless-I've purchased kits from them before-pretty nice stuff for accessory bolt kits, not grade 8 unless specified (grade 5 if memory serves), but I've used at least 5 of their kits on AMCs, Fords, and Mopars...never had any issues.
I bet if you post up what bolts you need information for, someone here can help you!
(e.g., what's the specs for an intake bolt, or left upper water pump bolt, or what type of washer is supposed to be used with the power steering bracket bolt that goes into the timing cover, etc)