pushrod length?

It's a hydraulic roller with stock magnum rockers.

I have some valve train noise after a cam swap. I bought an adjustable push-rod tool so I could measure and see if my noise was being caused by to short of pushrod.

I've never measured pushrod length before and I'm trying to get this figured out.
This is how I was told to check the pushrod length
1. Run engine for a few minutes to make sure the lifters were pumped up.
2. Put the #1 cylinder on top dead center
3. Remove the rocker, pull the pushrod.
4. Collapse the adjustable pushrod so that it is shorter than the
pushrod that was removed. Install the pushrod and Re install and torque the the rocker
to 22 foot pounds.
5. Extend and twist the adjustable pushrod so that is in the socket of the lifter and rocker.
As soon as you feel the pushrod start to drag, lock down the adjustable pushrod.
5. Remove and measure the pushrod.
6. To know the correct pushrod length you need to add .050 to account for pre-load.

After getting on top dead center, I thought I would check to see how tight my push rods were. Well they spin, but don't move up and down. According to the method I was told this would mean that I need pushrods that are .05 longer than what I have. My current pushrods are the stock length.

Am I on the right path?