Well, Naruto would become an even more formidable fighter. He could stretch his limbs like Luffy, which would add a whole new dimension to his combat style. He could reach enemies from a distance, or use his stretching abilities for quick evasions. This would make his already impressive ninja skills even more unpredictable and powerful.
In such a fanfiction, Naruto with Luffy's powers might change the entire Naruto universe. His ability to stretch could be used in combination with his shadow clones. Imagine a horde of stretching Naruto clones overwhelming the opponents. Also, in the ninja world where stealth and agility are key, Luffy's powers could give Naruto an edge in traversing difficult terrains and sneaking up on enemies in unexpected ways.
The best chapter pointer here is Chapter 62, "There is Something Strange". It opens with Sitting on the edge of her bed, she pondered for a while before lifting... and closes on Jiang Li reached in, pulled out a piece of paper, and slightly raised her....
Look to Chapter 103 for the clearest answer. It begins with Jiang Yan looked at Zhao Lang with suspicion, eyeing the dark substance in..., keeps building through It's not going to make my face fester, is it?" Zhao Lang smiled, "Do I..., and lands on Jiang Yan felt deep guilt welling up inside.
If you want the clearest chapter reference, go to Chapter 100. Early on, The barrage was about to die of laughter.; later, the chapter leans on [Hahahaha, help, why is the young master always being chased!] [Next door,....
The best chapter pointer here is Chapter 89, "Brother He, how can you be so unreasonable too?!". It opens with Director Sun took a step back, "What's the rush? and closes on If anyone should be mocking her, it should be me.] Wen Jiaojiao stood to....
If you want the clearest chapter reference, go to Chapter 79. Early on, Jiang Li leisurely said, "I bought this weeding machine, and according to...; later, the chapter leans on He, himself, had just finished weeding a piece of land, and to top it off,....
If you want the clearest chapter reference, go to Chapter 99. Early on, Seeing the man approach, one of the individuals with a long scar across...; later, the chapter leans on How is it, have those people outside left?" "They're gone." The man spat....
Chapter 91 is the strongest chapter-level answer because it starts from When Jiang Li saw that he had been assigned a harrow, Qi Tianyu felt his... and follows through on Hahaha, Young Master, what the heck are you thinking about eating!" "I'm....
The best chapter pointer here is Chapter 66, "This Sister Really Can Hustle!". It opens with I can't take it anymore, why did the young master even find a pair of... and closes on Unable to find a staff member to notify, and not wanting to waste time for....
A practical answer is Chapter 71, because it turns the idea into a concrete scene. The chapter opens with Shu Yan curled her lips with a hint of jealousy, "When can it be my turn..., adds pressure through The sun is so intense;
The best chapter pointer here is Chapter 96, "Can't Easily Forgive the Scumbag!". It opens with Jiang Li's words seemed absurd, yet there also seemed to be a trace of... and closes on Xu Ling couldn't contain her soft sobbing, "How could this happen?.