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If you're not making huge power, the advancing or retarding of the cams will play a bigger role than their lift and duration. I would tune with some type of management that gave me control over the cam position curve before shelling out big money for cams. Is the engine you're building a DE or an HR?
Sorry I should have been more detailed. I'll have a fully built motor and plan to run 16-18 psi. I would like to make close to 500 whp/tq on a mustang dyno.
You can make more than 500rwhp on stock cams. I have the Kelfords 272, on 17.4psi I made 601rwhp. A friend of mine has the GReddy setup on stock cams and he's making over 550rwhp. So do you really need cams? NO...Cams do come in nice though when you starting getting to the top end of the gears.