The stock GT block holds up fine with a 7,500 RPM redline, at least non-aspirated.
I recently surveyed the TMO FB group about this and I´ve been warned not to exceed 7200 cause of lifter float. Some even swore by just leaving the stock fuel cut off at 6800 active. The later recommendation was based on two blown motors.
I would love to spin the car that high and have more of my gears left, but at the end I prioritize a healthy motor.