Jeez. I'm not doing so good on this thread.
I just reread your original post.
This is the same engine block that the cam and lifters were originally in, only it has been rebuilt. Correct? That being the case... Was the block decked and/or the heads milled? That will change the distance between the lifter and the rocker arm.
Other than the push rods, somehow, getting mixed up, I can't think of any other reason why your getting the valvetrain noise from the same set up.
Your probably going to have to get one of those adjustable pushrods to measure and see where you're at.
Also, make for damn sure that this is not an exhaust leak that you are hearing. They can be tricky devils...
This is why I like roller rockers. Especially on Fords...