Don't ever assume that you're safe swapping in ANY engine blindly. A used engine is a used engine... P E R I O D. You wouldn't believe how many are known to be complete garbage and are still shipped. Video of it running? I've driven cars home after throwing a rod... 10 seconds of video of it running doesn't mean a thing. I've seen engines with phenomenal compression test results which then sat in an open yard for months with no spark plugs in place all the while allowing the rings to seize and the cylinder walls to pit like the surface of the moon. If you buy used plan on rebuilding it.
As for suspension: It doesn't take much to beat old, stock parts. Stiffer springs and decent dampers. Eibach's paired with KYB GR-2 dampers make for a great feel with a very low ticket price (while still streetable thanks to the subtle progressive spring rates). Add to that new bushings where needed (no need for urethane unless you can just get them cheaper) and stiffer sway bars and you may find yourself flat out stunned by the difference.
A fuel controller a type of piggy back. They all require an ECU to pair up with. Is there something else you're referring to?
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