Hey venomworldorder,
You should go to this web site
www.nitrobuggies.com and ask your questions there, this is an australian based web site, i have run 1:8th before and i had a mugen mbx5 and that car was really good handled very well and was a ver well engineered car, i also had a Rex 421B motor, i believe that you don't need anything more than one of these, it had everything the top of the range JP has, and not to forget the good fuel economy about 12 and a half mins out of a tank of fuel. So if you ask your questions there, it may help you a bit more. Hope this helps.
Thanks,
Adam