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Yes, with the carbs you can get rid of the ECU and EFI parts. The complete EFI harness can be removed. The guys that know on the site (from the past) say that the exhaust system is restrictive and opening it up helps a lot (see John C posts from the past) , and that if you decide to use a performance cam go big (see JMortensen posts from the past). The typical "Stage" 1 or 2 cams don't add much, apparently. So, the simple and effective way to add some power is with a better exhaust system and a big cam. Cams are more expensive than they seem because you need to buy lash pads and rocker arms along with the cam. The collection of parts costs can add up. But it's a pretty simple operation to get it done. Many people like the lighter flywheel. It takes more finesse on the clutch pedal but they say it's worth it. Fidanza is a good choice. For street driving an LSD doesn't add much. You might wait on it and see if you have traction problems. There is a ton on the site from the old-timers, around the 2000 to 2015 time range. Things have slowed a lot on the site as people have moved on. But their contributions are still here. Many of the guys were racers and/or engineers/mechanics/machinists and spent a lot of time and money on their projects. Today's car hobbyists really only know turbos and EFI since that's what they were raised on. Good luck.

An upgrade I did was the 280zx close ratio 5 speed with matching 3.9 diff. completely bolt on swap for both parts. Quick, easy, and somewhat cheap upgrade that really does pack a punch.