Tips on inspecting/buying a 40 year old car?

See if he will let you put a hose to it. If he does, wiper pivots ( look under the dash while someone hoses the windshield/cowl area) door seals, and see if the trunk seal well. Ask me how I know. Check underneath on a lift. Many cars were parked on the grass next to the driveway, especially if they were a second or third car. This was never kind to the underside. Looks like a solid car from the pics. Good luck