My .02.

Id shoot for a minimum for 10.5 comp with the aluminum heads. Ditch the cam and get a solid around 250 duration at .050. That hyd cam you listed is a baby, to me anyway. The SD is a good intake, no problem with it.

My car weighs 3800 lbs, using a comp 259@.050 solid, with no quench whatsover. 10.6 compression. Ported 452's. Ive had 3.23's, 3.55s and 4.30s in the car. Car runs fine with all 3 ratios. I honestly cant feel a big seat of the pants difference between any of the ratios. Acts just fine on the street.

I agree your combo wont make 550 HP. As planned Id say more like 450 or so. My stuff might make 525 if Im lucky.