Get the rockers first so you limit the wear on the guides and valve tips, and they can be fitted without a tune.
I would do the blower and consider an intercooler next, rather than changing camshaft.
Don't get it tuned intil the blower goes on and get an LS1 or LS2 MAF fitted when you do.
Injectors are part of the blower kit.
Once it's supercharged the best value mods will be doing whats needed to increase the boost, then do the cam, throttle body and heads last.
Cheers.
Mark.
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