I would contact Nick Wilson at www.compu-flow.com for all the parts and building help you need.He has helped me for over 25 years building big blocks.
You really need to get the book by AndyF to make your parts selection right the first time.
My 493 build with Indy EZ heads cost me about $5000 with me doing all the assembly except the cylinder heads which Nick did for me because I bought them from him.
It's fun and frustrating at the same time when you build a stroker because nearly everything needs to be custom fit and require some kind of fitting.
Very rewarding work though when you tach it up and let the clutch fly with over 500 ponies under your foot
Gus