Q16 is expensive and you have to use a lot of it. It is also really foul smelling and will eat away at the carb and the fittings over time. I did a Q16 engine for awhile and have no desire to go back to it.

But it all depends on what the owner wants to do. If it is a bucks up program with a crew chief and a tire wiping monkey in the pit crew then who cares. They can handle all of the maintenance and the driver gets to go down the track a little faster.