In the sizes we run, we're typically at 32-37#. Adjust based on how the car feels and the tires wear. If it starts to wear in the middle more than the outside it's over inflated. You can also paint a thin stripe across the tire and see if it's wearing more towards the inside than outside. The only time I pressure the tires to max psi is when I won't be driving the car for a while (so I don't get flat spots).
Another thing...I kind of lost track of what tires you bought, but if it's a summer tire heed warnings about not driving the car below certain temps, most often below 40 degrees. The compound gets hard and you lose traction...this can happen when the road is perfectly dry, so you're not expecting it...I've had a close call with my '70, and an even closer call with my 18 ZL1...and temps were only in the low 30s'.
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"If the best Mustang is the Camaro, the best Camaro is actually the Firebird" David Zenlea
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