I like to overthink engine engineering as well, but to a point .05 worth of rod/stroke ratio,5cfm, etc... isnt going to matter much in a streetable engine so don't beat yourself up over minute details. I'm doing a VK56 as soon as I have the time to get it running. I like the engine quite a bit, its miles over square and has a 1.6x rod/stroke ratio, six bolt mains, and four valve DOHC heads with big ports on both sides.