The cheapest power you can get right now is probably a stock bottom end LS, Gen III Hemi, or Coyote ford with a turbo charger on it. Its insane how fast some low budge builds have gone. One of our own members has stepped over to the darkside and gas a 8 second turbo LS mustang, I just can't remember his screen name lol.

The sloppy mechanics 8 seconds for $8000 build was interesting also. Started with nothing but knowledge and went 8.83 for 8000ish. Link https://sites.google.com/site/sloppywiki/sloppy-builds/8s-for-8-mustang