How much for a 318 Magnum?

If its a '93, its not TBI. TBI means throttle body injected. Yours has an injector per cylinder. Then, you left out the number one question asked on a motor, "how many miles"?????????????????? Last, most people will either be replacing their motor (meaning they already have the wiring) or they will be putting it in a classic and will be going carburetor so the wiring will not up the price much. Finally, I would say if it is a perfect running motor with, lets say 110,000 miles, then 400 is about right.