I was just wondering how has done the Carb swap on 1989-93 5.0's, and if you were able to use the stock fuel lines by cranking the psi down with an adjustable regulator.
well, you don't use the stock fuel rails, but oyu can use the stock lines, adapt them to a Barry Grant (or equivalent) return style regulator (pn 171021), and then to the carb.... easy.