I picked up a good builder this week through work. I got a '99 vintage Vortec 350 with a knocking rod. Its a roller block and the heads are in bitchin shape so I thought I would use it to build my new engine. Now I have a few questions... Its a 2 bolt block, will I need to convert it to 4 bolt mains if its going to see 6000 RPM and nitrous regularly? I plan on studding the main caps either way. Its also going to be stroked. Do I *need* to run roller rockers, chromoly push rods and guideplates? The tech I work with said he likes to run them and they would probably work good on my engine, especially if it runs lots of high RPM's. Im already planning on studding the heads and prepping it to run around a .500 lift cam. Forged or Cast crank? Will I be exceeding the limits recomended with a cast crank with a 150 shot of nitrous, and 6k RPM? Anything else I should look out for? Anybody have a good recomendation for a set of resonably priced forged pistons for a 383 that are dished so I dont have 10.5:1 compression with my 64cc heads.