What I mean is, I can do this with factory iron heads, stock stamped steel rocker arms, and a link belt timing chain. You seem intelligent. I would like a list of manufactures and components with part numbers that you deem sufficient. I could design engines all day long that will fit the performance and dollar criterion but you may consider insufficient quality. I by choice would design something in the $10,000 range because I take pride in my work but I can make something for under $8,500 too.
I can slap a turd in a box and stamp guaranteed on it. But all you're going to have is a guaranteed POS.