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Need to change heater core and also locate a heater valve (missing) for my 84'. Can I hook up the hose from manifold to water pump to bypass core and keep it that way over the summer w/o drivability problems and w/o concerns of overheating?
Absolutely. The parts stores sell a plastic tube that takes a 5/8" hose on on end and a 3/4" hose in the other, just for that purpose. Since it was only temporary, I just connected the heater hoses, together, at the firewall. They were in good shape and I reused them when I replaced the heater core.
When I bought my car in 1986, the heater control valve had already been removed from the car. I never would have known the difference, if I hadn't spotted one in my parts book. You really don't need it.