For ease of instillation and availability of parts, try to get as many factory parts as possible! I am no brake expert for a 80-82 CJ but My best assumptions are that he will obviously need a power booster and a proportioning valve. New master cylinder might be needed but unsure. When I converted my manual drum's to power discs, Those are two things I had to add to the system (obviously the new discs, calipers, etc.. too) Good luck!
Johnny