A bit depends on your power level, but from my experience my guess would be about 5 to 9 mph slower than speeds you reached with the rolling start. I did a standing 1.25 mile start in Miami and picked up about 7 mph (Whipple at that time). Most others with lower power went about 5mph faster than their mile times. Those with higher power levels were really only about 9mph faster. 1.3 might make a little difference over 1.25, but not much.
I know I would have been in the low 130s if I had started from stop as I probably could have been there in the standing mile with a few more runs, (I only made two). Most of the 1.3 runs I started at less than 30mph with rolling throttle because I was intimidated by the guy standing there starting us.:thumbsup