The 6.2L was the Diesel option for the 80s Suburban's. If you want Gas only so you do not have to add the sound files for a diesel I recommend the 7.4L. The 80s 5.7 had 230 to 245 HP and the 7.4L had 230 to 255 horses
I look at this brochure and did the engines. I know they have the same sounds, it is really hard to find good sounds for FS25.