[1971 cheburban]

Man I'm learning a lot, what kind of pushrods do I need, can I buy them or do I have to have them made, and what good rods to use, I don't need the 800 for 8 expensive set but I want a good set, and the .400 longer ones too, also the distributor, can someone explain how that works, like if I was to use regular big block heads and intake, do I use a regular big block distributor? Or do I have lot have the adjustable one? Thanks everybody for your input