So, will putting a bigger throttle body and bigger fuel injectors on a internally stock motor yield any results, or does it have all it needs?

 

A larger throttle body will not provide any significant increase in air flow on a relatively stock engine. Since you won't see any added air flow, you won't need any added fuel. In practical terms, you might see a small decrease in pressure loss across the throttle blades with a larger diameter throttle body, but I doubt you would see more than 5HP on a good day. The stock injectors can easilly handle that small increase.