Can't help but think the Holley what you call them > double pumpers... 2 outter fuel bowls soaking up the heat from a hot intake and engine.
The difference between Holley and Edelbrock is Edelbrock has the 2 fuel bowls protected under the removable top bonnet plate. less heat transfer to the fuel.
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One other thought is the original assembly line 318 blocks hold more coolant than the later re-engineered 360 blocks that use the same exterior casting as the 318 block, so less coolant will fit inside.
So naturally the 360s over heat, then add an overbore and a stroke pushing more power (heat) out of the same block, sorry to say it's going to overheat, unless evasive measures mentioned above are taken.
Good luck on your quest...
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