Well, i'm confused! I belived the vertical air filter was on the 500 k engines! and so Heller engine kit was right! sorry for this big mistake!
paints are varnished now. news in few days or hours!
Yes, the last picture of your engine shots is a 500K, where you can see the horizontal air filter on the other side of the valve cover. Don't be misled by the 540K shot with the red engine, or others with lots of chrome -- very customized by the restorer. Use satin or matte black for the cylinder heads and flat aluminum for the block/oil pan.