New rebuild....but tic..tic...tic

So, I have a fresh rebuild on a 75 318 with 70 heads. Unknown if they were previously milled.
Running a Hughes Whiplash hydraulic cam with their lifters and springs.
Heads were rebuilt and stems were equal with a straight edge when I checked.
All new stock valvetrain, rockers, shafts and push rods (7.5")
A quick check with feeler guages shows .035-.045" stem to rocker clearance.
Not sure why all stock valvetrain would be off..but it is.
I'm trying to get hold of an adjustable pushrod to get better measurements.
At that point, I'm assuming I just find longer pushrods based on my measurements?
Would I just measure to zero lash and add in the recommended preload of .080-.085?
Am I missing anything?
BTW..Hughes does state their cam ar not as quiet as stock cam.
Don't run it anymore.

Check lifters for signs of cam failure. If all checks out...get push rods .075 longer than you have.