Hey guys so i am building a custom R/C race car and i am looking for a good engine that will fit my build.

The Specs:
All carbon fiber and titanium.
It is 4wd. most likely by a shaft not pulleys.
It has push rode suspension
It is a 1/6 scale so there is plenty of room for a fairly large engine.

Here are the dimensions.
Length 814 mm, width 336 mm, Wheelbase 464 mm
I really don`t care what kind of engine it is. It just has to be fast.
gas or nitro will do