[snakeeyes]

I agree with fastd. You might use 24 pounds as a starting point and look at wear and pressure increase after a few laps. I've never tracked any of the Cobras I've owned but have tracked my Lister replica pretty extensively. Frankly the biggest problem was getting the tires up to temp and keeping them there because the car is so light. The typical Cobra replica is probably 300-400 pounds heavier, but still light compared to anything made today. It's been a few years but IIRC when I was running on R-compound tires (Kumho V710 was my usual), I would start pressures in the very low 20s and then reassess as the day went on.