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If it's boiling power steering fluid it will also boil fuel in the carb which can get expensive.
If it was me I would remove the rad cap, block the wheels and run the engine to operating temperature and see if there are any bubbles, increase rpm to 1500 or more if need be.
The 440 engine in my car still has the original 22 inch radiator and the original clutch fan it usually runs at 180, in traffic 190
You did not mention what temperature the engine is at when it overheats?
I would make sure to install a good thermostat next put it up on the (Rhino) ramps and slowly fill the cooling system with coolant, then (with the radiator cap off) block the wheels and run the engine to operating temperature and check for air bubbles.