They gave you more studs than you're likely to need, so install all the intake, exhaust and fuel pump studs you need as well as the one for the distributor. If you don't have A/C, you'll have a few extra.

Don't buy a new camshaft. It's most unlikely your original cam will have any issues. But even if it has a questionable lobe, use it until you find a new or good used cam for a decent price. Camshafts are easy to change later.

If the rockers are doubtful and you want to use your originals, you can swap them, but use the Chinese cam caps and rocker rails. Page 2A-5 in the Haynes manual has a good illustration and the steps to disassemble and reassemble the rocker assembly. Be sure to use the Chinese cam caps. They're machined with the head so they mate and align perfectly. Your original caps may not if you try to use them.

Disassemble the assemblies starting at the rear (#4) end. Pull the bolts out of the cam caps and the caps will slide off followed by the rockers, springs and any washers. Keep everything in order of removal. Don't remove the rails from the front Chinese cap (#1). Reassemble the Chinese rails using your original rockers, springs and washers and the Chinese cam caps. Use the Haynes manual to guide you.

After it's all together, install it on the head and tighten the cam cap bolts until the caps seat. Look closely at how the hydraulic lash adjusters contact the valve stem top. If any adjusters are contacting the edge of the stem top, you'll need disassemble the rocker rails and insert a washer to move the rocker so the contact point is more to the center of the valve stem top. Hopefully the Chinese head has been manufactured to stock specs, so the rocker-valve stem alignment will be correct.