I bought a a 1990 Honda Civic Si and plan on using it as a SCCA auto cross car. The stock motor is pretty much shot. 4 of the valves are bent and need to be replaced the head gasket is gone and the motor has 150k miles on it. I want to do a swap but im a little confused on what motor would work the best for autocrossing. Or would it just be better to rebuild the current motor with different internals.