Apples and oranges
Ported ede's to run the same as the rhs head Brian does will run in the 2K+ range. Porting alone is usually in the 400-600 range to get the 260ish+ range. Upgrade the springs from the single/damper to beehives, you'll be in another $300.
Base ede's without any correction work cost more than the RHS head ready to bolt on.
+ porting
+ VJ
+ Surface
+ Spring change
= more dollars for a head that performs the same.
It takes about 420-425hp at the rear wheel to move a 3400# car to 120mph.