Small chamber Edelbrock heads on a 340

diference is that the ones made for the 340 are cut like stock type heads
the 340heads work well with pistons that have a positive deckheight since the cutout is there to make clearance for the pistons reason for using a thick gasket with popup pistons is that if/when you build another shortblock you can build it with modern/better/lighter pistons at zerodeck
hope it makes some sense