William,
I am sure you can make your system work, but you MUST make sure all the air is purged out. That is the most likely reason it is running hot. It is steaming in the head because the reverse flow system and the way the t-stat works in that will trap air in. Thus the need for the air bleeder on the upper goose neck.
I would really prefer to see you install a radiator from a 1993-97 F body and use the pressure tank. I have a spare surge tank if you can't find one. These systems are closed, meaning they don't blow excess build up into a overflow tank, then syphon it back it as it cools overnight. So, the radiator cap is sealed where you 69 camaro cap is vented.
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