273 rocker arm adjustment

Sounds like you are on the right track but I would question the valve lash. I have never known a hydraulic cam to be set at zero. For the hydraulic lifter to work as designed it needs to have preload. The piston needs to be towards the center of it's stroke so to speak. Thats why you always adjust them to zero and a half a to a full turn on the adjuster. The intake valves look to be larger than stock and stainless steel. +++ there.