I hear and odd sound but it does not sound like rocker chatter. It sounds more like an exhaust leak but I don't hear it through all the rpm ranges. This is why I was asking about adjusting the valves. I have tightened up the exhaust system to the manifolds and tightened up everything else around the exhaust system (air tubes) and the sound is still there. I will keep listening and poking around.
I don't think it is time to adjust the valves based on what ya'll have said. I am not sure what type of nuts are on the studs. The car has been driven 6000 miles since last adjustment.
use a wooden dowel or wooden broom handle on the rocker cover with the other end in you ear and listen for a different sound. same for the fuel pump. you can check the fuel pump by just removing the bolts,pull the pump away from the block and with the fuel in the carb the engine will keep running but the pump will not be working. my new 70 454 450HP chevelle had a knocking fuel pump the first couple of weeks i had it and that is how i found it.