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The most common causes of vapor lock occurring in your fuel lines are the fuel getting to hot in the lines and vaporizing before it reaches the engine. Wong fuel volatility (such as using winter grade fuel in the summer time), try refueling the car with the proper grade fuel.
I would have it looked at. An engine knock because of low oil is real bad. Serious engine damage is now occurring every time it’s being driven. there probably is damage to the pistons or piston journals or the crank shaft damage due to inadequate lubrication.
It sounds like the head gasket was not seated properly or improper torque was applied when bolting down the head after the repairs were completed.
Have you checked your fuel pump for power and fuelflow, replaced the fuel filter and checked idle settings? It sounds to me like the car's only running on the accelerated warmup system and stalls when that is turned off, this could indicate insufficient fuel supply.. Check the voltage at the pump, it should be about 12 volts, if not you might try running a power lead directly from the battery to the pump to see if that cures the running issue. In that case a fuel pump rewire might be the best way to go as explained on http://www.1300cc.com/howto/how2/rewire.htm Also check under the car for kinks or dents in the fuel lines which could restrict fuel flow.