And what about the rear?? C10

Ok so im set on the bag department now i wanna go to the next stage.. lower. I plan on "z" notching the frame 3 1/2" to make it lay frame rather then crossmember. And im gonna section the frame in the low spots to make it lay pinch weld. But what about the rear when the front is "z" notched is there anything i need to do to the rear to make it match the front or will it be low enough already? Bags arent done this is why im asking. If the back will already be on the ground awsome. If not what do i gotta do to make the damn thing lay pinch weld completely throughout the length of the truck. Thanks again for helpin the newbie out! Ian