ET is so dependent on the driver's skill (especially on a six speed) that it is almost irrelavent as a means of comparison. I have seen stock Supras run 14s with a poor driver, then the same car run low 13s with a good driver.
MPH is a better judge of your car's performance as it is not nearly as dependent on the driver's capability. Judging by your 60', you have a pretty good handle on launching your car, especially if this was done on the stock 255 x 45 x 17 tires. Your mph seems a tad low, but this may be because of temperature, humidity, altitude, etc. My Supra typically ran 104 to 107 mph depending on weather, and that was at 33' above sea level. But it is an auto, not a six speed.