5.70 is to high for west london and probably anywhere else!!
i was running 6.1 at wlrc im now set up for the next dry meeting at amcc,ive found the hw motor to have a very similar feel to the gm i used last year ,hence the gearing is around the same as i ran then,the lrp motor was at 6.9 for amcc and just over 7 for wlrc