cam change
Alot of guys on here have more experience with cam shafts , but in general a roller should help HP because of its design, rise fall times which also can help cam indexing timing and durations. That being said they can be a little more expensive and harder on the valve train. I would be quessing at the HP gain, the proper overall combo is as important or possibly more important than the actual type of cam, but generally roller will help if you have the cash to buy them.JMO