Strange noise coming from carb

(just in case someone comes across this in the future) So the final verdict on this one was a few (slightly) bent pushrods that came from my exhaust valves sticking. Apparently my rocker arm shaft was put on wrong and was causing oiling issues. Caught before any real damage was done to anything and it's running quieter now. Lesson learned: don't let Chevy guys help assemble your heads without double checking everything lol.