Not having personally done it I'm not the best person to ask, I'm sure someone else will be a long with the fine details but if you want to do it properly you'll need a vernier sprocket so that you can get the cam timing and chain tightness accurate, they're quite expensive for what they are though.
Alternatively you can use a standard cam sprocket and dowel it to the cam once you've drilled new holes for the correct timing position. Depending on which cam you get you may not need to do this, it all depends how it aligns when everything is together.
To accurately time the engine you will also need a DTI gauge (I think that's what they're called
) and some kind of angle dial on the crank so that you can find TDC precisely like so -
http://img.photobucket.com/albums/v699/ ... G_2504.jpg
With a new cam new buckets should be used too. You will also need thicker shims to match the tighter tappet tolerances of most cams.
Also if this is going to be a race engine and will see north of 7k, heavy duty valve springs should be used. If the revs are going to stay below the redline for road use, new standard springs will be absolutely fine.