It all depends on the shop, the kit, and the build. Your builder will also have certain "must do" things to prep the block... Some shops think the kits are fine out of the box, some measure and don't accept them as delivered... Find a reputable shop to use and ask them.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.