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1981 upgrade 5.0 l efi

  1. 5.0L Tech
    I have a 1981 Mustang Ghia with a sluggish 255 V8 with a 2 bbl carb and plan to replace the engine and transmission with 5.0 L EFI V8 complete with Fuel Injection and 4 speed automatic transmission. I know I've seen articles on this before. How easy is this to accomplish? Is it hard to adapt...