Compression and Cam selection

I wouldn't use DCR. About as useful as a sun roof in a submarine....
The DCR formula does not take into account how well the induction system flows, & therefore it does not know much air is packed into the cyl.
Also agree that a cam around 224 @ 050 would be good [it is always a compromise ].
Such as the Comp 270H Magnum or Isky 264 Mega. These should have good vacuum, they are on 110 & 108 LSAs. Use wider LSAs if you want to kill the power...