Ok the issue has been solved. I loosened all the rockers and set them to zero lash when moving the pushrod up and down. I must have tightened to much on the adjustment nut. Thanks everyone who suggested valve lash.
You're welcome. Always a sigh of relief when things work as intended.
I used to bracket race my 355ci Malibu many moons ago, started with hyd and then solid lifters. Sometimes, we'd swap rockers so we were always playing with lash. 1/4 turn past is typical, but I'll be ****ed that atypical always seemed to happen with aftermarket cams and such.