I went through this a year or two ago with the scout car at the museum. I ended up buying a rebuild kit from an Australian dealer, but in the end could just as likely have got away with tightening the stuffing a bit.
Try the pump as is by tightening the gland nut a little, otherwise the rope type stuffiing is available at most plumbing suppliers. You will want to watch it with the NOS stuffing that is out there. They may well contain asbestos or vermiculite particles. Your level of success may well have to do with how scored your shaft is presently.
I have heard of others who have had the waterpumps rebuilt/modified using modern bearings and seals.
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