1976 305 in my chevy c10

[rick0312]

I ID'd my motor and found out that I have a 1976 305 camaro motor in my 69 c10 fleetside. Is this motor underpowered for the weight of this truck. I notice when i shift into 2nd and third gear I hear alot of valve chattering at low rpm's. At idle the engine sounds fine. What can I do to this motor in order to cut down on the valve chatter? I have tried high octane gas and i still get the chatter any advice would be helpfull......Thanks........Rick