The gear someone else runs has nothing to do with the gear you need. The optimum gear is dependent on what you do with the car and a dozen other details.
Don't swallow the popular bologna about a turbo needing a tall gear to "spool".
If you primarily drag race the optimum gear is almost always the gear that puts you across the stripe at peak RPM, and obviously that would vary with maximum RPM, tire diameter, converter slip, and MPH. I run a 4.10 with 28 tires and trap at 7800. My car slows down and is harder to manage with a 3.73 or 3.55, and it goes too high RPM with a 4.56
If I ran mostly on the street with a engine that liked to be at 2K rpm, I would gear it to be 2K on the street at my common cruise speed for my converter and tire diameter. Mine works out to be about 2K RPM at 45 or so on 28's
Figure out what you want to do, including the tire size and cam, and then pick the gear for your combo.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)