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I have used cam timing bushings on small block chevy's. The range of adjustment is usually +-5 degrees. Any more than that will run the risk of piston/valve interference. I am unfamiliar with the Ford but if it has a pin to locate the cam gear this is a simple mod. If it has a keyway you could try an offset key. I don't know if these are available but they shouldn't be too hard to machine.. I have been thinking of trying a cam advance on my van since I think that lowering the torque curve would lower the required throttle opening for equivalent acceleration and reduce fuel consumption. As for changing the rockers, I remember reading about someone just changing either the intake or the exhaust rockers but I can't remember the reasoning behind it but I think that this would be worth some further research. The rocker change would increase the lift but NOT the duration which is what you would want for increased torque.
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