Well your safest bet is gsr cams but i'm not sure if it will require any tuning. Your next safest bet is ITR cams but these will require tuning. It's a good idea to upgrade the valvetrain with these but you don't really have to if you're keeping the stock rev limit. It's still a good idea to upgrade old tired springs with any cam upgrade though.

I would recommend you upgrade to something that can be tuned first.. CromePro is good and free. Just get a socketed ECU and find a cromepro tuner.