Well now what?

Well I got the motor torn down enough and I don't see any issues with the cam , lifters , or pushrods. Could there be issues with the cam that are not obvious to the naked eye. I am no mechanic. I can post pics of the cam after my work day is over. The timing chain seemed to have more slack in it than I would've liked to see considering its only a couple hundred miles old if that. If I took this thing apart and the issue isn't even my new cam or components and its something else that would suck. Maybe the noise is in the cabin and not under the hood. Maybe the factory tach is loud causing what I think is the noise or the speedo. Seems very noticeable at 2500-3000 rpm's