Hi about the head gasket testing it is not hard with proper tools and a little know how 1)get a radiator funnel kit any tool place have them for about $20.00 best investment u do for now
2)installed in radiator and start engine if coolant does not come out like a fire hydrant then let the vehicle engine to come to operating temp if u start seeing the dreaded bubbles coming out of the radiator u got head gasket problems.
3)at one or two time i found also leaks @ exhaust ports, remove exhaust manifold, after bringing engine to operating (exhaust manifold i s HOT) pressurize radiator and look for coolant drop in exhaust port very common with F2 heads.
2.2 head they are not hard to do , 2.6 head a little more work
THE RIGHT TOOLS AND A LILLTE KNOWHOW .........PATIENT GETS THE JOB DONE !