ticking at high rpm

Preload is to tight and the plunger comes down below the hole in the lifter when cruising. And the lifters go dry. Set the preload by shimming the rocker shafts , getting shorter push rods or getting adjustable rockers. This was caused by heads shaved or block decked. common problem with mopars. The Preload should be no more then 1/4 turn down after zero lash for a street car with a after market larger cam with adjustable rockers. Zero on a race car.

Many times guys don't run into this with a large cam after decking or shaving. This is because larger cams have a smaller base circle not a larger lobe this make up for the the difference in the shaving/decking and guys get lucky.

Check the preload and correct the setting. This will cure your problem. Steve