Im not positive, but I dont think they even make gas engines that are small enough to fit on a 1/10 scale chassis? I'd agree with 7M and just invest in a 1/5 to begin with, and go from there..
<font size="4">BUT</font>!! If you happen to do a franken-mod and put a gas engine in a 1/8 or 1/10 vehicle, PLEASE take pix and video and post em here for all of us to see!!!