, I recognize that engine bay. @aidan that's the G13BA 8-valve EPI, that was a engine/harness swap from a foreign used Jimny 1300 Sierra. Local samurais came carbureted.
As V2NR 3.0 said, you can get parts for both G13BA 8-valve carb & EFI, as well as G16A/B 16-valve EFI from the US from rockauto, ebay, lowrange offroad, etc.
The G16A 16-valve (5-pin MAF) is a JDM engine, and not available in the US.
Then there's the G16B* 16-valve (3-pin hotwire MAF) which was in the USDM Sidekick/Geo Tracker as well as 95*-98 JDM Escudo.
There's also the G16B 16-valve (coil-on-plug ignition) which came in the Grand Vitaras. (Gen2).
Also, a G16A 8-valve EPI which looks similar to the G13BA 8-valve EPI, except the intake pipe sits on top of the rocker cover. These came in the USDM Sidekick/Tracker, as well as UK Vitaras(Gen1) and I think in the early year Escudos(Gen1).
Imo, best engine for the Samurai/Jimny is the G16A/B 16-valve (5pin or 3pin MAF) coupled with TrailTough/Petroworks/Calmini engine adapter plate kit.
With 1.6 16-valve, you have lots of power to turn big tires, even if you change your diff gearing to suit.