bad part is to use the spread port on the existing 4.80 bore space blocks would be dropping a brick on your toe.limited by valve size,how much better could a spread port configuration be?and stepping up to a 4.84 means new block.if your going to spend the coin on that,why not go even bigger for relatively same cost.its a tough situation for the mopar faithfull.i believe there is room for another wedge head that would flow in the 500 range. that could be usefull,sort of fill the gap between whats available.and some new blocks too....