Stock 360 build - What carb?

I can’t tell you how valuable that gasket is.
Ma MoPar used a thick gasket as stock on there carbs. The aftermarket gives you a paper thick gasket. There about 1/16 thick vs the stock thickness of about 1/3.

Aluminum carbs heat up and boil away the fuel. Sometimes even running engines suffer from to much heat and the fuel starts to boil in the carb as soon as it gets there. This makes the engine run very lean. And tuning a royal pain because it keeps you guessing.