lets pull this apart shall we...
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I spoke with Mast Motorsports about their stage 1 (least Aggressive) cam which is designed to be used in conjunction with a supercharger. They told me any cam switch requires replacing the valve springs for proper engine wear. I also spoke with Ron at Vengeance Racing and he recommends changing the springs at 30,000 mile intervals to maximize life.
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just about any cam swap will require new springs. reason being is that GM designed the springs on this motor to work with this cam. if you swap in another cam with a higher lift value, then you are pushing the stock springs further than they were intended to go.
as for the 30k, ive heard of it, but never done it. and dont know any one else who has, with the exception of guys who are thrashing their cars at the track all the time and pushing every bit of their motors to the brink.
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I intend to supercharge this engine. I am tempted for the price/performance gain to start by first replacing the cam. I don't want to lose the bottom or mid-range acceleration. I also don't want to damage the engine. I've read everything I can find, but don't understand it well enough yet. I have been following pharmMD's build, which is along the lines of what I intend to do.
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if you know for an absolute fact that you are going to supercharge the motor, then you will want a cam that will maximize the supercharger's added power. that being said, some blower cams without the blower can drive/feel like @$$ as they are made to work in conjunction with a s/c.
and since you are going to be pulling the top of the motor apart anyway, id hold off on the cam swap until you are ready to do the s/c install. as you need a tune 99% of the time with a cam swap. (the other 1% is for hot cams and such that are just a bump over stock and while you still need a tune with them, you can function without)
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Also, while the engine is taken apart would it be a good idea to replace any other internals? I do have a budget and will be forced to do this in stages. I intend to keep the car so I can take my time and do it right.
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we've already seen that the LS3 can take quite a pounding without the need to upgrade the internals. if you have the budget for it, look into getting your heads ported and polished. also if you havent done it already, a CAI and headers should be on your to-do list.
give Mast another call and talk to them with your plans in detail on your overall goal with the car.