flat tappet cam in magnum motor?

I got caught that way once too. I said sorry, too, AFTER deleting my comment,cuz I said to myself,something like;" By now,the OP certainly has cured his problem,and he may even be dead."
In this case, I agree that ZDDP is a good topic. But it has been kicked around quite a bit during the intervening years.
And as to rollers? Well my next project will be rollered, just for longevitys sake. I had that awful sinking feeling, just one time, when 2 lobes fell into the pan, within minutes of each other, after an oilchange,on a two to three year old cam.It probably had 20,000 plus miles. Being rid of the worry alone will be worth it.