Revtek 3" vs Billy's set at 2.5"

I'm currently running the revtek lift. I need new shocks and was thinking it's a good oppurtunity to change me package. Being that I don't have enough money to change the coils and everything. I wanna know, what if I got the billy's and set them at 2.5.( Stock coils)
Would I lose any lift compared to what I got right now?

I know the revtek says 3" but is it actually? Or would the lift be the same. And later I cAn put the new coils in!

Anyone with some knowledge of both please help me out.

 

Bump

 

I'm thinking you lose the 0.5" of lift. I don't see why the revtek wouldn't be a full 3" if that it what it is advertised as.

Is the revtek a coil spacer or top plate spacer?

Once you get new coils remember you have to set the billy's back down so you don't go over 3" of lift total.

 

Coil Spacer.