you will probably be better off running 20C's.
burst is only for a few seconds though and for most of the run you won't use very many amps at all. take a 5000mah pack for example if you get 10 minutes runtime out of it (quite short i know but if you really are tearing it around a track possible) you are only using 30A average over the run
__________________
cars:
vintage 1988 tamiya grasshopper
Brushless CRT.5 - Mamba max - medusa 36-50-4800 motor - ftx 5K lipos
Brushless CRT - Mamba monster - Neu motor - RCPD conversion kit {for sale}
Ebay items :
http://shop.ebay.co.uk/merchant/terzo53