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I think spending the money for the E-boks is a waste of money... unless they are ported. The cheapest, easiest HP gain for an FE, especially the strokers, is CFM. Undy is correct. After porting, I was happy to get the flow that a bone stock BB Chevy starts with. Those LS7 numbers are awesome!

The only way to prove this to yourself is to buy a computer dyno program and start plugging in flow numbers. You will see the HP gains in black and white. I went from 525 HP to 608 with ported heads and big valves - dyno sheet and flow test in my gallery).

Good luck

Brian