I just got done with that same issue on my 87, I replaced the head gasket had all new hoses installed, put a new water pump on and fan clutch. All to find out my radiator wasn't cooling to specification so when the car stopped the pressure was still in the system as the coolant was too hot. I HIGHLY recommend taking out the radiator, take it to a radiator shop and have them flow test it. The average cost is around $15.00. It may save you hundreds in the long run and either way you know for certain if it is or isn't good enough at cooling. As the radiator heats up the fins are supposed to disperse the heat although a Toyota that is older sometimes has their radiators deteriorate. the money you spend on getting it tested will easily pay for your time and frustration in the long run.
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