iv built a few identical engines to that.. sounds like your looking at comp cams magnum cams? sounds like you will have around
9.50:1 with vortec heads (ther is more to calculating cr than that) but im taking a guess. whats more important than static cr is dynamic cr. it is reflective too what you would see on a compression gauge. it is directly affected by your static cr and you cams
intake closing point. with that said i would tend to the neither of those cams would be a good choice. if i was you i would go for the comp magnum 280h cam. it sound cool, and makes awsome power