i have the same prob gettin 5th gear when mine gets to running temp. i just live w it, i think if i mess could make it worse. it helps if i push the gearstick down (like when you choose reverse) when engaging 5th.
nice car thou. shame he didnt vac the drivers foot well before taking pics for ebay.

just have a steady ride back, check all fluids b4 setting off, keep an eye on the gauges and listening for odd noises.