Factory Five also sells a dedicated race car version of their street car. You could also license the race version FFR, but why would you? It would be rather silly to buy the stripped down version and then add all the stuff required to make it street legal. That is why by far the bulk of the sales of either company is not the race car, it's the STREET version, which comes ready to license. The race only version of any manufactured car is a very limited market. It's a good marketing ploy, but a bad business model if that is the only thing you offered.
FFR's approach is a low cost race car alternative primarily for a certain class. Shelby does the same thing, on a high dollar level, a specific race car version for a specific class.
JBL could be added to the mix. They never intended to sell very many of their cars, which are primarily "race cars" that are meant to be licensed for the street. But those cars are hardly JBL's bread and butter, it's just a side line for them. An interesting egineering achievment. Which no doubt, would kick any other Cobras butt on the track,,, in street trim, licensed, drive to the track, kick butt, take names, drive home.
I can imagine an extreme light weight Kirkham with all the race goodies. Now THAT would be a race worth watching! Bring on the JBL's, the Shelby's, the FFR's and the BDR race prepped cars, ye haw!
On any given Sunday, it's all about the class, the driver, the preparation and the marketing BS when the smoke has cleared.