You are asking questions that point to you not necessarily understanding how these parts interact with each other. Thats ok, learning is part of the game. The cam doesn’t have to “handle the pressure from the intake or carb”. The cam spins and opens valves. The intake and carb are the path for fuel and air to enter the engine. Earth’s atmosphere provides the pressure. You can (but shouldn’t) stick any small block mopar camshaft in there and it will work. Some will be more optimal than others.