If you don't know which lifter went on it's respective lobe I would definitely get new lifters. FWIW whenever I pull a cam and lifters and think there is any possibility they will be used again I put each lifter in a zip lock sandwich bag and write the position [ eg. 1 IN. ] on a piece of masking tape and put that on the bag. The bag keeps the lifter clean and oiled and separate from each other.