But for a pure trailer it to the track racecar then YES spend the big bucks to get the best of everything. Put the parts in it for your torque band at what RPM you want, the Horsepower will follow.
Ues you can get a good set of pistons for a 318 for around $600-$800 a set and then spend the $300 to have the crank balanced to them. Puts you close to the $900-$1300 price ranges for the set. I just think in over all costs.