73 340 SB Rebuild, Need Help Selecting Parts

4" Stroker under 500 hp with cast crank is what I did if you are going to rebuild it. Would use Chinese aluminum heads done/messaged by a reputable shop like Brian at www.immengines.com . TTI shorties or Thorley headers, etc, etc.

Or do you need to reuse Pistons and heads to keep cost down that way?