Hi, The Stage V is 1/4 to 1/2 higher, The one that Aruza sells has been milled. Call to make sure.I think that is how he sold them a few years ago.I have a cuda with a shaker & a stage V. You don't have much room to run spacers on it. I made 836hp & 730 tq with a stage V with two thunder series carbs, of coarse I have more cubes than you. We also have a 472ci. street car with a stock intake & original carbs…….dont waste your time going that route. Do the stage V with the thunder carbs or scotts & never look back! I would call aruza to ask about the milled intake for extra space.