My 78 K5 Federal Emissions just barely passes WA emissions. It came with no cat and federal - heavy duty emissions. If I move to CA what is the likely hood of me being able to bring the K5 with me and get it registered in CA? Would I even need a CA emissions test?

there are no heavy duty emissions on a blazer.
. Although, I reccommend not coming into this ****hole of a state. You get a roadblock everytime you try to do anything.