Since you already have the heads off it just seems logical to me to install a larger cam or have one regound. TVT ported and polished a set of our heads with good results the flow cart was very impressive. Our heads are capable of alot of air flow they just need the valve out of the way long enough to do it. anyway there sould be a large improvement in air flow, the more flow = less restriction = less hp to turn sc = more hp to wheels