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Look at the top tube and down tube in the headtube junction, check to see any ripple, deformation, crack etc.
Luhged can be hard to tell as it could crack along the line of the lug, so cleaning this and a q-tip for close inspection.
Lastly, even if it look alright, putting a new fork in and wheels will show the clearance between the tyres and downtube, it should not be very close to the downtube (unless jys those old track frameS).
considering buying a frame with a bent fork, considering that this probably occurred in an accident what else should I look at on the frame to ensure it's otherwise ship-shape?