400 block stroker kit or pieces to build a 500-512

Agreed. I spent about as much piecing together my 440 stock stroke as I would have stroking it. 700$ rods 700$ pistons. 200$ for rod and main bearing. Already at 1600. I was iffy about the quality of 440 source during my build, but I plan to use them for my 400 block soon. Wish I would have gone that route with the 440