Originally Posted by EdwardN

You have pretty much answer on your question with those links. I just want to add:
Force which is pushing piston down is equal to pressure multiply on piston top area. So bigger diameter means more force will be pushing piston down. So base on your links and force you can make your decision. Also as a tip, I iwll recomend use timing calculator to calculate engine capacity ( you will not need to use formula). Timing calculator you can find http://www.palmarisracing.com/Timing_Calculator.htm
I hope I was helpfull.