Fel Pro makes nice gaskets and ARP makes nice bolts and studs. I don't think anybody will argue those.
Rear main seals can be quite a bear but as you are pulling the engine you should be ok. The originals were made of rope but more options now. Lots of opinions on the best products and courses of action. Some have had good luck with a product only to have it sworn off by others. Lots of threads here you can look up on the topic. Viton is a popular choice.