I'd question the fact that he says it's a Ninja 500 engine and runs 10.50.
A stock 500 won't run anywhere near that in a motorcycle much less in a car chassis.
Stock 1990 Kawasaki Ninja 500 EX 1/4 mile Drag Racing timeslip specs 0-60
1/4 Mile ET: 13.487
1/4 Mile MPH: 97.300
1/8 Mile ET: 8.528
1/8 Mile MPH: 81.260
0-60 Foot ET: 1.994
Temperature F: 70.0
http://www.dragtimes.com/Kawasaki-Ni...lip-17312.html
http://en.wikipedia.org/wiki/Kawasaki_Ninja_500R
12.73 s @ 102 mph