comp cams lifters

I ran a comp cam/lifters in my old 383 Cuda. Clattered like crazy. Called Comp, they told my my preload was off and buy adjustable valve train. I did. Could not get them set at all. They would bleed down as soon as I shut the motor down, and could not get any adjustment on them. Called the tech support line several times and each time they told me how to adjust the valves, and each time was different. I got pissed off with them and bought a set of Sealed Power lifters and never had a problem from that point forward. Spent hundreds of dollars trying to fix their shitty lifters.
I now refuse to run a Comp Cam in any engine of mine.