Hey LX, you having heating problems or what??? Why allllllll the cooling system parts at the same time including the overflow tank and water pump? BTW, can you take a picture of the reverse side of the water pump, I've never seen the impeller in the 80 water pump. Thanks man, hope yer runnin cool!
Replace the water pump, hoses, thermostat, rad cap, maybe think about the fluid coupling on the fan, flush the cooling system, re-fill with Toyota red/pink, and you're good to go for a couple more years, before needing another round.