Max valve lift questions

No such thing as dumb questions. We all started where you are. Max valve lift depends on many things. Almost like the weakest link in a chain, but not weakness but what parts have the least clearance. Which could be the piston to valve clearance
Which could be the valve retainer to valve guide clearance.
Which could be the coil bind clearance on the spring.
Which could be the cam ramp too steep so the lifter can’t follow the ramp.
Which could be how far out or in of the lifter bore the lifter can travel before uncovering the oil band.
or, can the valve spring actually control the speed of the valve. More lift in the same time frame means you have to move the valve faster. That is harder to control.
Something is going to be the tightest clearance and will determine max lift.
However, don’t worry about max lift number. Let me draw you a picture. With a cast iron production head you have about 1.80”s of valve spring install height. That is measured from the spring seat to the bottom of the spring retainer. You take a spring that is 1.80 inches and compress it until there is no space between the coils. This is called coil bind. The spring will be a little over 1” tall. 1.1-1.3 really depends on the spring shape and wire dia. At this moment you are limited to .500-.600” of lift. Is that max lift? Not really. You can install longer valves and space the rocker shaft up. That should take care of your installed height limitations, but now you have valve cover clearance issues and flat tappets aren’t going to work, roller lifters only. My point is when you try and approach a “max” anything, the definition of “max” varies and out on the fringes , theybe dangerous waters there, a place where money goes to die.
The real question, what are you goals and end use for the motor. Max valve way down the list of important things. I run 11.80 116mph with .558 lift solid flat tappet. The car could run low 11’s with that lift if it were “normal”