Stick with the efi, its easier to manage and with the general small power you want out of your 5.0 you can get it with fuel injection without any hassle. Get a nice set of heads like the AFR's or Edelbrock RPM's do mild headwork like a port n polish with gasket match. Throw in a nice cam the Xtreme energy cams from comp make great power and top it with a quality intake GT-40 / Trick Flow / Holley .......whatever, get a super tune and you will have your 300+ rwhp. With all boltons of course 8)