do you have a part number for the headIf you want to have a hybrid head that has 300 cfm of flow, use sections from an LS3 head that has rectangular intake ports.
Do not waste time using any of the LS cathedral port heads.
If it is a stock head, have it ported after it is completed.
We were looking at using an inexpensive aftermarket head that flowed 320 cfm right out of box.