Hmm. Yeah- I think most of the time you just add the girdle anyway, so just check to make sure everything's lined up after you bolt it in and you should be ok. I'm pretty sure that you DO have to machine the main caps on the bottom to even get the girdle to bolt up if you didn't have one before, so there's still some machine shop time required for a proper installation. If you already had a girdle on the block, you should be good to go without getting the block cut again.