Engine making clicking noise. What could it be?

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Hello, my name is christian and i am a new member to 67-72 website. i just recently purchased a 1970 c-10 lwb and i have had alot of problems with it to say the least. I havent started any body work or anything because i was hoping to get the truck in good running order before i go further.

Just recently my engine has been making this really annoying clicking noise. It does it whenever the engine is on and speeds up whenever i accelerate. I have been wondering if it is the fan belt but im not sure. i have the original 307 engine in the truck so i assume it could be a number of things.

Any info would help!

Thanks, Christian