Re: T&D roller rockers, Cam, and Heads
Question 1: With a good H/C package with roller rockers (and exhaust) you should see 515-530 rwhp. You would not want to deck your heads to boost compression if you are going to install a S/C later.
Question 2: Cost - Good heads, complete - $4000, Cam - $700, T&D's $1100-1200 plus install, gaskets and fluids.
Question 3: Do it NOW before the S/C! I saw Sean post that his customers with H/C packages and his S/C are putting out around 730 rwhp.