302 head questions

I will be buying some valve guides and start on my heads. I know this is easy stuff but I want to make sure that I have my info right.

What size valve stems does the 302 valves have? 3/8"??

Where can I get bronze valve guide liners or valves and what size should I get? I would need to do mail order and they need to ship through the U.S. postal, can't do FedEx or UPS.