[mickmate]

I agree with tire comments. I would change them to Avons or Billboards depending on use and car set up then drive it and enjoy it for a bit.
The SC's or Semi Comps had either the quick jacks (or quick lifts) mentioned or the full street bumpers consisting of the over riders you have with a tubular hoop nudge bar between them. The look of the over riders by them selves is a bit unusual. Some of these cars are detailed beyond description and there are countless threads on here about what is period correct. I have been called one of the rivet counters as I like the cars to be as correct as possible and to know what really is correct. They are fun whatever your approach and have always been custom built and customized to owners tastes.