I just bought my son a EM one with all original parts and motor with 188k miles. I am very new to the scene, and would like some direction on what steps to take to draw the most power out of it.

Should I rebuild the motor so it’ll part another 200k
should I just work on swapping out the components from the head and replacing items with aftermarket components?

My plan is to restore this vehicle to its original state and keep it running for another 10 years