If you want simple, "cheap", and mostly plug and play, you can do a PiMP megasquirt or a EFI Source microsquirt for the ford wiring harness....but you need a new engine harness... soooo....
https://lmr.com/item/LRS-93CWH/Must...k2THS2HZBQndCfRPDH-nY11rR7ywSS7BoC63cQAvD_BwE
https://www.efisource.com/wp/shop/microsquirt-for-1986-93-ford-5-0-mustang/
https://www.stinger-performance.com/store/tuning/pimpxs-engine-management
https://www.stinger-performance.com/store/pimp-harness-sequential-8
https://lmr.com/item/LRS-93CWH/Must...k2THS2HZBQndCfRPDH-nY11rR7ywSS7BoC63cQAvD_BwE
https://www.efisource.com/wp/shop/microsquirt-for-1986-93-ford-5-0-mustang/
https://www.stinger-performance.com/store/tuning/pimpxs-engine-management
https://www.stinger-performance.com/store/pimp-harness-sequential-8
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