Here! if your vehicle is a daily driver and no drag strip action staywith oval port small valves, that will keep your torque band within drivability. now if you have a havy right foot and like to step on it often peanut's will do even with 2.19/2.88, or if you take your hot rod to the drags and cannot pay for some aftermarket heads square is the choice if you can find a good shop that can port/ polish and re-valve your heads to 2.300 combo for max flow, remember that can become expensive, like i always tell my friends and customers think of wath you want to do with your car, because, you cannot have the best of ALL Worlds.. also remember heads are the best upgrade to an engine but , must take in consideration other items, such as, cam , compretions, tranny, vehicle weight, gearing, etc. and most of all. the use of the vehicle...