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Hm, carb. I've had heat soak problems with carbed '83 LandCruiser and other friends I know have had probs with it too, but it's usually mechanical fuel pump. Running electric pump and routing fuel lines away from engine block fixed those probs. What was happening was after stopping and sitting for short while, heat would soak in engine compartment, fuel lines would heat up, cause vapor gas bubble, & pump wouldn't pump. Sometimes called vapor lock.
Other heat problems, I've run into heat soaking starter, but you said your starter cranks fine.
Coil is another possibility. Marginal coil can sometimes go funky with heat.
And actually another one my friend ran into with an old chevy with exhaust & intake saimese manifold, loose nut on intake. Ok when cold, but heated up would expand open up and cause vacuum leak.
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