Who know(ses) about hoses?

I have both a 71 300 with the 440 and a 66 383 (4v). I want to progressively start replacing all rubber hoses (vacuum lines, radiator overflow, heater, etc). Is there a resource on the proper sizes and lengths? If I were going to buy some in bulk, what should I buy and how much?

I apologize if this is common knowledge, but all the inner/outer diameter is overwhelming me, and the guys at the parts stores are no real help.

Maybe there is a kit for A or B bodies I should look into?...

Who know(ses) about hoses?