Probably about time-rocker adjustment

I'm late to the party here but suggest you keep your adjustable rocker setup even if you decide to return to a hydraulic cam and lifters.
The 273 adjustable rocker system is a good setup for a street engine with either a hydraulic or solid lifter cam.
If you return to a hydraulic cam and lifters, you shouldn't have to adjust your valves often but you can always check them for proper hydraulic lifter preload.
If you decide to remain with a solid cam and lifters you will need to adjust the valve lash periodically.
You can only correctly check valve lash on both intake and exhaust valves of one cylinder at a time. Both intake and exhaust valves have to be fully closed with their respective lifters on the base circle of the cam.
After setting the valve lash of both valves of a specific cylinder you will move on to the next cylinder and rotate the engine so again, both valves are fully closed with their respective lifters on the base circle of the cam. There is a specific method in doing this so find the procedure and follow it to the letter.