crate engine would be the way to go, BUT you still need to put limits on other things no adjustable cockpit shocks, no weight jackers, just plain old oil shocks if you dont do that it will be just like the late model deal you will have someone buy 1500-2000 worth of stuff to make there stuff better. thats all it would really take, also a good tech person to check engines, also put in a weight rule, no ti parts. you would be suprised by how many you might get to support this