No Livorno (Well I have a very old one from SCGT but it would need tons of work for just one race, so not worth it) but we would replace it with Monza, which was used in 1936, hence somehow period accurate (Or with another of the non season GPs, like Donington or Tripoli)
For the tracks we would use the ones from FD Design for the 65 F1 mod, they are not always the exact layout for 1937 but are close, and overall look quite period accurate and gorgeous.
In any case, the bulk of the 2019 HSO season is already programmed and WIP where needed (We are however limiting the modding considerably as we are exhausted from the effort of these past years), so it's not as if you are going to miss a 1937 season. There will be room for it anyway if really desired.