true ze makes 150-160 WHP with bolt ons , the de block with Ze cams is no high compression ze pistons are dish and forged internals so just swaying cams and intake will not make it a ZE motor, i would just buy the whole motor , if your doin all this work just best to do a full sway then built your DE for boost take your time do it right or built the ZE for boost , as for worth it thats really something you need to answer presonally i like KL motors and i think it is but if your end goal is a monster hp then no, 250-270 is more then possible and there are a bunch out there making that easy but takes time and knowledge.