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Assuming you're still checking this thread here are some additional suggestions.
1. Make sure you're getting all the air removed from the radiator. Best is to have a petcock at the top to open while filling the system until no more bubbles escape. Don't know if your new aluminum radiator has this provision.
2. Make sure hoses anywhere in the system are not collapsing once they get hot. An almost-kinked hose will soften with heat then further restrict flow.
3. As Rich suggested get the thermostat back in, with a small bleeder hole. Removing it will not help and can screw up how the coolant circulates in the block during warm-up, creating hot spots.
4. You should have started with a clean block and heads free of corrosion and deposits. An old dirty block can release crud and plug up the radiator, and have poorer heat transfer to coolant.
5. Check the engine timing and idle mix. Too advanced and too lean will run hot.
6. If you have an aluminum intake with exhaust crossover under the carb, consider blocking it off or adding restriction to reduce heat transfer to the temp sender and carburetor. The airflow in the 914 engine bay is poor and the carb can heat-soak and exhibit vapor-lock or flooding from secondaries spilling over.
I've got a mildly-built Chevy 350 with air conditioning, and drive it here in Tucson where it gets pretty damn hot. I run an electric pump, 180 deg thermostat, and 3/4" steel pipe under the car and have no problems in city or highway driving.
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