Strongly suggest reading this before rebuilding the block. I don't know if you have plans to go forged or not but if not read this. This guy is intelligent in what he does with dsms. Hope this helps: http://www.jackstransmissions.com/pages/crank-walk
If it will shift into reverse with the engine OFF it's the clutch.
If it will not shift under any circumstance it's either a linkage issue or an internal issue
Start with maintenance. Take it from someone who didn't. You'll end up spending a bunch of money in mods and the maintenance stuff that was doing fine under "Stock" conditions don't do so well under higher hp conditions. Buschur rafcing's website has a nice upgrade sequence to follow. Check them...
I strongly suggest you DO NOT get the rotors turned. I worked at a shop for many years and our biggest return on brakes was warped rotors after they were turned. The more you turn your rotors the harder it is for the rotors to dissipate heat because they keep getting thinner. I would get new...