A 270 cam should be fine. The street grind on todays camshafts have a very mild ramp and are very easy on valvetrain components. You should get years out of a set of valve springs and only need to run the valves once a year or so.( a silicone spring is all you need for the street) If you need to runthe valves more often you have a problem in the valvetrain. A steel flywheel will assist with low gear if you find the cam is to sloppy and hesitates from a stop. A Cobra only weighs 2500 lbs so it doesn't take much to get her going.
Brent
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