Ben, the HPI records list might have something to do with the use of a drag radial:
http://www.hpi.com.au/drag_records.php
From that MPH, the 300 is capable of being no.1 and a flat 10, high nine is possible.
Alot of cars were getting loose last night, as were the bracket meet cars on Sunday. Apparently due to the resurfacing of the track last week.