Fuel injection or carburetion? Much depends on how you intend to drive your Mustang. If you're building a daily driver, consider the ease and simplicity of electronic fuel injection - ideally a Ford factory set-up copped from a late-model 5.0L Mustang. If you choose carburetion, opt for the most reliable stuff out there. The most reliable four-barrel carburetor out there is the classic Autolite 4100 from Pony Carburetors on top of an Edelbrock Performer or Performer RPM manifold. Holley's trusty 1850 is also a good carburetor. Keep sizing around 500-600cfm.