I just got a rebuilt 289 put in my 68 mustang and after less than 100 miles on it, it's developed a loud ticking noise on cold starts and gets less noticeable after the engine warms up. It sounds like its coming out of the drivers side valve cover. I have tried unpluging one spark plug at a time to see if the noise goes away, but it doesn't. I don't have a lot of experience with working on engines, but am trying to learn. So, I'm not sure how far I should get into this before bringing to a shop.

Any help would be appreciated.

Thanks,

Dbob