Strombecker 66`Barracuda slots.

Very cool set and in pretty good shape. These and most sixties slot cars (& toys) are fairly rare in really good condition. Yes these were sold in Dealerships.
There are a few guys that make replacement tires for these, check on eBay. You should be able to run them on your Scalextric track but the guide will be too deep so you might need to trim it.
These guys have original drivers figures for those Barracudas
Strombecker Slot Cars & Parts