[hobgoblin351]

Think of the engine as an "AIR" pump,. The first things to changed in order to flow more air would be exhaust, headers, intake manifold and carb. The next bottleneck would be the heads. A bigger cam, or high lift rockers would help a little with stock heads. But, you'd fail to see there potential because of the stock heads smallish valves and port sizes. Bolt on new say trick flow heads with big valves and ports. You immediatly improve flow and leave the door open for even bigger gains( ie; adding high lift rockers, bigger cam ) in the future when you have the money. A good set of heads does not come cheep. But it is money well invested. When my motor finally goes(knock wood) I'm taking the heads with me .