These are the words you never want to imagine on a diagnostic report:
*Recommend new engine*

Details:
1994 3VZ-E 4Runner; purchased Nov, 2004 for $3,900.
150,000 miles; "idled rough" when I bought it.
Changed drive belts, cap, rotor, wires, plugs immediately.
Compression check results: 140, 140, 140, 140, 140... *10*psi.
Poured oil into #6 hole and rechecked; no change. 10 psi.
Yanked the injector for #6, and changed the oil for my new V5 engine.
Took it to BrakeMax in Tucson to check valves.
They took my $70 and told me air was coming out of both valves...
AND air was leaking from #4 into #6...
AND there was oil in the radiator.

Any suggestions? Anyone know any trustworthy mechanics in Tucson? Discuss amongst yourselves. I'm feeling more than a little verklempt right now.