Its generally cost efficient to have them do it as the tool is expensive for the few times it is used (unless your friends tip you a bit for borrowing it if you buy one). You could redrill the cam bearing vertical feed holes to 1/16 and the ones that feed the heads to 1/8 which is plenty of oil for journals/journals that feed the heads & leaves more oil for more critical areas. probably not a dealbreaker in your deal and it'd be extra labor time for the shop or you could purchase them yourself then drill em & some shops squalk at carry in parts. Short version: yes let your shop install em & bring the cam in with you along with the block