I've owned four T-crafts. Great airplane but has its limits.
Pre-buy look for:
Wing strut AD complied by X-ray or ultrasonic, or replaced with new sealed struts. It's a bullsh*t AD but it exists. If not complied, count on removing struts and having them X-rayed, and deduct $1000 from price of airplane.
Lower longeron cluster inspection AD complied with. This is a big one, because two people were lost in a T-craft when this cluster failed (corrosion). If this airplane is not a seaplane and not lived in a humid environment then you can expect it to pass inspection, but you MUST get under there and look at it for real.
Standard fabric airplane stuff, rust in lower longerons, poor fabric work, some idiot spraying shiny car enamel to hide a crappy fabric. Fresh or recent enamel paint over older fabric is a guarantee of some idiot trying to hide something. Deduct $3000 or more from the value of the airplane IMHO, knowing you need to go in and find whatever he was trying to hide.
Wing root attach fittings wear. Lift a main wheel off the ground by lifting with both hands at the same side strut-wing fittings under the wing. Have it completely quiet, and have another person listening through the inspection holes at the root whie you take the weight on and off the wheel. You are listening for a clunk-clunk noise, which is the spar fitting bolts moving back and forth inside a worn fitting (either the spar or fuselage fitting). Deduct $3000, still buy airplane if you want, and fix the fittings using the drawings and info I posted on the taylorcraft.org website.
Standard fabric airplane stuff, damage and mis-alignment of the upper fuselage cabin structure. Several sleeve patches in the upper cabin X bracing, patches where the front spar carry-thru meets the door posts, etc. Most old airplanes will have been bent up once or twice, but it has to have been fixed correctly. Deduct $1000 and buy it anyway
if it flies straight and hands-off. If it has quickie trim tabs on the control surfaces or wings, or if the washout (twist) angles are different from one wing or another, then they are trying to compensate for a bent airplane. The very best way to check this out is to find an old-school free flight rubber powered model airplane builder and ask him to go look and see if the airplane is straight or not. I'm not kidding. You can also measure it with strings, but an old modeler will see things

Play and looseness in the aileron hinge brackets, where they bolt to the rear spars. You should not be able to lift or lower the ailerons (the entire aileron, not aileron "throw") relative to the wing.
The T-craft frequently gets the sheet metal cowls all butchered up, replaces with C-140 parts, stop-drilled 50 times in a row, patched up with beer cans, etc. The cowls are expensive to replace.
A 65 HP Taylorcraft, with a wooden prop, in Provo, when it's warm... will not be a rocket. In fact it may be a single place airplane. When you do the upgrade to 85HP, and put on a metal prop and VG's, it becomes a really capable airplane. But no matter what you do, the Taylorcraft will be snug for two people... maybe even more than the 150
Post a notice on the
http://vb.taylorcraft.org discussion group, that you are looking for an experienced T-craft guy near you to go look at an airplane. You should be able to find someone closer to you who can look at it. How much money is this thing supposeedly worth, meaning how much money would you take for your 150?