I hate to do such things in public as I always botch it up.
If we use the right triangle formula
A² + B² = C²
stock measurements
C =10.5"
A ~ 6 - 6.25" (let's use 6)
110.25 C² - 36 A² = 74.25 B²
B is 8.616" long stock
if we use a shock 12.5" long C=12.5
156.25-36=120.25 and the sqrt is 10.96
10.96-8.616 = 2.34
Everything else being equal you should picked up
2.34 inch of lift, but since the shock is fixed the angle
changes as the swing goes down it also goes foward in relation to the top mount point and A becomes shorter,
how much so with 12.5" shock I do not know.
Maybe the stiffer springs make up the rest -
If this holds true a 11" shock should -
121-36=85 sqrt 9.21
9.21-8.616 = .60
So I should endup with a bit over a half inch of lift
and may close to 3/4 , I'll measure it before and after when they show up.