Rebuilt magnum 360 Noise

Braeden, try checking the length of the pushrod by marking the valve tip
Here's one article that describes how.

Lunati How To Verify Valvetrain Geometry

You're correct. There's no adjustment other than pushrod length. With your cam you shouldn't need to have longer pushrods.

Edit: I just read through the entire article. I cant see why you can do it with hydraulic lifters. I checked mine after getting it together.