Re: Cam question
Hydraulic: use a copy of the 69 L46 camshaft. Almost the same specs as the 327-350 horse hydraulic cam noted above. No other changes needed.
If you are up for solid lifters, use a copy of the 70 LT-1 camshaft. Federal Mogul makes a cam and lifter kit that is available through Rock Auto. If you do that, I would pull the heads, and install a thinner head gasket to raise compression slightly. With the extra duration (and tighter quench) you can get away with 10.5 or even 10.75 easily. You can re-use your manifold and Qjet (virtually the same as used on the L46 and it was rated at 350 hp), or go with an aluminum hi rise.
With either of the above you can keep your stock springs. Just don't wind it above 6500 regularly. But then, really no need for more with either of the above combos as the torque curve is pretty broad.
I also would not go to the trouble of hogging out the intakes for 2.02 valves on a street car. I know you didn't ask about head changes, just trying to anticipate the next question.