The only way I would do any of that stuff you are asking about is if you have cash to burn and you just want bragging rights to say you did it.
Take it from me... don't chase the big NA horsepower. I blew my balls chasing 400 NA RWHP, 11 second street car on a stock 4.6 bottom-end and 3v heads. I got there after 3 top-end rebuilds, 5 transmissions (sticks and autos) 4 drive shafts and so many rear-end rebuilds I lost track. To make it worse, once I finally got that big NA power, it lasted for one race season before it blew. In the end it was less fun to drive on the street because all NA Mustangs only make the big power in the 5500-7500 range with less than stock performance down low.
Do yourself a huge favor and buy a nice KB or Whipple and forget about it.
If you insist on doing it NA and you want a great street car that will do well on the track... take half the money you are getting ready to spend on a new engine swap, trade in your car for a 2014 with 19" wheels and 3.73:1 gears, put a nice deposit down, finance the rest and use the leftover cash for some nice bolt-ons. It will be faster and cheaper than what you are getting ready to do. You add CAI, LT's, custom tune, Barton shifter bracket (if you get a stick)... you will dust anyone NA off the line on the streets and you will run high 11's with DR's at the track with everything in the car including the spare tire in the trunk.
Shit, I weigh almost 400 lbs and my 2013 pulled 4.6 0-60 times stock and 4.2 with a CAI and a tune.
