049's usually use the 118 cc reference for CC'ing. Displacement figures should be used for one cylinder. worry about swept volume and dome cc's or dish cc's (negative cc's) and it's quite easy to figure.
Remembering that deck height (DC) volume is the volume of area when piston is down in the hole at TDC.
4.135 rods? Go back and refigure your combo and rethink the formula Kitz gave you.
It really is quite simple. We just have to dust of the Math part of the brain to go through this.
Calculators are a God send.
Take a deep breath and it'll work out.
If those heads haven't been butchered through repair work, you should snag 'em.