Some people may disagree with this but here goes:
Any inprovement in cylinder head and exhaust system flow and velocity will increase torque, up to the point where the largest pressure drop is the stock carb and intake.
Better head and stock cam is way better than stock head and big cam. If you improve the head and increase the cam slightly your miles ahead than stuffing a big cam into an otherwise stock airflow system. Drivability suffers.
