Desktop dyno question

so it just asks for stroke, bore and head style? That's missing a key component...cc size! Is DD5 downloadable or is it payed for? I know the original DD was posted here by me about 15 years ago, came on 1 1.44Mb floppy disk. Can you put in open or closed chamber heads? ie 302 (273 size) would be closed and 915 (360) would be open. Edelbrocks can be either (340 are 'open' for +.018 piston relief)