440 head noise. Perpetual problems. Problem solved

So I took in all the info and I just can't seem to figure this one out. I went back out and tested pulling each plug wire off since now I kinda know what I'm listening for and there was no change in the sound. In got under it and bumped the engine and checked all the bolts and non were loose and the flex plate was not broken. So I started it and it's odd but for the first minute and a half there is no sound and then it starts off low and gets louder and louder and it actually sounds louder today than yesterday. When I put the car in drive or reverse the noise goes away. It seems to be right at the middle of the valve cover. If it was a broke ring or something wouldn't it be smoking? I'm out of ideas and I canceled my hagertys road side insurance or I would take it out and run it until it broke!