My '53 J has been in the family 40+ years. We've done nothing and it's fine. The car is stored inside and that's a big plus. Henry Js (especially '51s) leak big time and if they sit outside for extended periods, the floors rust out which is pretty typical for them. If the car is stored inside you're fine. My '52 Vagabond has original floors in it too. I put new mats in it in 2001 and there have been no problems. I agree with Jim, it's only original once and if it is to be stored inside, you won't have any problems.