1939 lincoln zephyr conv.

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My father left me his 39 lincoln zephyr conv.The car was restored and stunning but has a few problems .when the engine gets hot it wont start,and it seems to skip quite abit.the engine has new rings ,points, wires, starter rebuilt , double positive ground, 8 volt battery.the radiator was cleaned, water pumps were checked.carb rebuilt...i pulled the plugs and they were black.....iam going to try another set of autolite 216s........any ideas????I would also like to know what the approx. value of the car is. I can send some pics.<BR> thank you <BR> chris