Not a rocket ship but they pull off low 15 second quarter mile times
About the weight, i think i would be able to get total weight around or under 1000 lbs. On my other 250 with me and another person (about 700 lbs) it could still get up to 80 pretty quickly so i dont think another 300 lbs with much better aero would hurt that much. Think fully stripped, no dash, aluminum plate floor, and the stock engine bay would house just a gas tank instead of a motor and tranny.
The sprag clutch would just make p&G + EOC so much easier. I was thinking about using a hand clutch on the gear shift lever and it would suck having to hold it for long periods of time.