Yeah it will drop right in its a d series, and for the rebuild if the block was bad like smokeing or the bearings are bad or you where burning oil stuff that the motor was bad to start with yeah rebuild the bottom end. Just look at this way all dseries are interchangable so goes for bseries as well. But if the block was good and the head is to just put them together nothing has to change. It will fall in fine no mount has to be changed and when you put the head on the block I would use the y8 head gasket with build. But overall if block is good dont do anything just put it together and you'll be fine.