8 1/4 gear swap ratio difference???

Hey Guys And Gals. Just Purchased from another member. A N.O.S set of from mopar richmond 4.10 ring and pinion never installed !!!!! dated 1973. My Question is. I have a 75 8 1/4 under my 68 dart with a 3.21 gear in it. This Housing originally had a 2.76 gear in it. Will This 4.10 gear fit or will I have to buy another housing ????? Maybe Clearance the inside if needed ?????????