wallace compression boost calculator

using the wallace compression boost calculator should i go by the standard way or the effective way
its a big difference

my set up now 128 od c screw bae fat head
10.6:1 ,60 psi, 2500 ft std = 53.37:1
effective =23.40:1
new set up 75 od c screw
i think boost will be around 38 psi (chime in if different)
12.6:1 ,38 psi, 2500 ft std =44.67:1
effective =23.36:1

now this is std which seems very high and dont want to find out hard way
15.0:1 ,38 psi, 2500ft std = 53.28:1
effective = 27.9:1


so which one do i use

im just trying to keep cyl pressure same as with 128 od but i dont know which one to use

i dont think i could get 15:1 on a bae hemi anyway

thanks

 

Wow. That’s a hell of a calculator. 15:1 on a screw. The tuning window on that would be none existent. I can’t believe that people would use that.