Crate Motor question

I'm familiar with Stock Eliminator cars but am putting together a crate motor combination and had a couple questions. I've searched this forum, as well as the IHRA web site, and still had some questions. My car is a '94 Z28 (hardtop stick car) that I'm going to put a 350/330/340 Vortec motor in.

1. What class(es) will this fall in and what will my race weights be? I know it is a natural B or C car with the LT1.

2. Are roller rockers permitted? I have a set of GM LT4 SA 1.6 rockers that I picked up somewhere.

3. Who would be some good sources to contact about having a nice set of heads done? I am going to do the shortblock myself.

Thanks for any help! I really appreciate it. Scott