/6 head bolt + ring and bearing suggestions please.

^^^ What Killer6 said. I'm not sure where in OR you live, but if you have trouble finding parts try Tony's Auto Parts in Vancouver. They got me main bearings (Federal Mogul IIRC) and Hastings rings, and did so promptly.

Make sure your engine is really a 79. The main bearings are different between the earlier forged cranks and later cast cranks.

Take the head and rod bolts to a wire wheel and clean them up, then use thread chasers for all the threads on the bolts and block. If you are going to dingle ball hone the bores, I suggest giving the block a hot water soapy bath after honing and chasing threads - you don't want that crud inside the engine causing trouble. Blow it out to dry it off and give it a wipe down with Marvel Mystery Oil in the bores afterwards.

I'm not sure why you want to replace the lifters and pushrods? Unless you have something wrong they should be re-usable. Make sure to keep track of which lifter and pushrod came off which cam lobe. They need to go back in the same hole when you reassemble.

If you need a good machine shop try Somers Racing in Vancouver.