blocks being placed in an odd way

I'm instantiating different size cubes and one called a foundation now when i look at the foundation with another foundation equipped its supposed to place it in the nearest side I'm looking at that being said it is working but only when the original has no rotation if its slightly rotated it makes them not line up properly this is completely baffling me i understand whats happening but i don't know how to fix it. I need a way to say position something in a position relative to the first objects position and rotation not world space. Any help is much appreciated.