1970 MB 250 .....Almost mint condition

My 1970 MB 250 runs like a top, except when I drive it at high speeds for more than a half an hour. It just dies out. It's getting spark, but I have to wait for about an hour for it to start again and it runs fine. What do I do?

[Benzmac]

Fuel pump, fuel filter, check valve that allows air into the tank.....

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
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[mbdoc]

The electronic ignition control "box" was a high fail componet, this is the type of problem that this can cause.