As long as you can pass smog you are ok it depends on how the rest of the Runner is weather to put more money into it. If you do a wet compression test with a couple of squirts from a oil squirt can motor oil or ATF works just fine and see how much the compression goes up. If that low one only comes up a little then you have a leaky valve that would require a head gasket job with a valve grind at a machine shop or a lapping of the valves I vote for the machine shop about 350.00 they will also adjust valve lash. If the compression do move up alot them the rings are worn. If it's valves an
other 300.00 for a head gasket set and head bolts check rockauto for pricing If you do the water pump you are 1/3 of the way.
