[hemi43]

Without trying to sound too harsh, it sounds like you don't have much experience with engines, so rebuilding one may not be what you want to do. If I were in your shoes, I'd go and get a crate engine from GM and put that in. It will bolt right up, have decent heads, have a warranty and really won't cost much more than to rebuild the engine that's in your truck now. Even without that breather you wont be pressurizing the block as long as your PCV is working properly. Just my 2 cents !