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Watching tire wear is the key. Most of the wide tires used on Cobras these days take considerably less pressure than you would think.
If you can find some powdered chalk lay out a strip of it and roll the car over the strip and compare the imprint left by the tire to the tire itself. If the pressure is too high you won't get a full width print. If too low you'll get a wider than tread surface print.
You can also use a pyrometer to measure the heat of the tire across the tread surface after running them for a bit. Colder on the outside edges of the tread is too much pressure. Hotter on the outside edge is too little. Target is the same temp. across the tread width.
I'm running 27 lb in my Goodyear DS-G3's 275/315 combination and it seems maybe a bit high. Something I still need to take care of.
DonC
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