Not Ranked
CobraBuilder,
When it stops pop the air filter and work the throttle - are the squirters tossing fuel in the the venturii? If not it is fuel delivery problem, otherwise it is ignition.
For fuel delivery:
Pump to close to something hot (header, exhaust, etc.) causing it to overheat. This is not likely a clog as it would show up very quickly not after minutes. It could be boiling in the fuel line if it runs near the headers.
For ignition:
Is the MSD inside the engine compartment? If so mount it under the glove box - heat can kill them - many posts to that effect. If you shield it with some insulation in the side facing the engine and it runs longer - that might be it.
The pickup in the distributor may be acting up with heat.
Try to rule things out one by one.
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