Help spec'ing out a new small block

To add on this valve shrouding discussion my flowbench head adapter is a 4.010 cylinder sleeve. I could cheat the system a little and go 4.060
Or even 4.100 and the only one that would know would be me. I’m sure I could squeak a few more bragging numbers to my customers like many do on uncalibrated flowbenchs. I don’t buy into this shrouding as much as some guys because I see what my heads flow with a 2.08 valve or even my bigger valves in my Indy heads.