what motor do you want to run?
if you can do without a street bike motor it would be easy to put a dirt bike motor in it.most of them are smaller than your 150 but make more power.a cr 250 is around 40hp or so and will fit were your 150 is so you dont have to extend the rear end.
look at horsepower on some of the motors to see what you want and to give you an idea of how fast it will be think of this
my buggy was about 500lbs with about 10hp so 1hp had to push 50lbs
500lbs with 40hp =1hp only pushing 12.5lbs
500lbs with 100hp=1hp pushing 5lbs
look at the hp to lbs of a vet.or a viper
that wont give you dead nut speed but will give a ball park
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