In addition to Cpearce, which was very accurate, a lot has to do with goals of the plan on the upgrade. I highly recommend ported Edelbrocks. However, there are also other choices that may fit the bill cheaper. There is some talk going on at another thread and Promax came up with there CNC “Shocker” head with 185cc intake runner flowing at 285cfm for $2,025. They also come with a 2.08 intake valve.