351 swap, to expensive to be done or not to bad

I thought about a 351 swap in my 03 gt. I of course wouldn't do the work myself. How much of a hassle would the swap be. Lets say for parts and labor, not counting the full engine. Of course would like the factory guages to work. a/c would not be a problem i would just delete it. Saleen put these in sn95 mustangs, so i figure the parts are there. I'm just looking for a round about estimate.

I thought about this based on the expensive amount of money it cost to build up a modular n/a car and only get 300-320 rwhp.