Hi, I had a GM 350 that would do that and a mechanic had me convinced it was a worn timing slapping against the cover and he was going to have to pull rad and everything off the front of engine to replace. I am lucky he didn't have time to work on it that week. I took it home and used the old broom stick method and found it was coming from the fuel pump. Remove fuel pump and the return spring was broken. I guess the fuel pump lever was not following the cam and at certain speeds was making the knocking noise.
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