Wish in one hand, **** in the other. See which one fills up faster.
The EEC and harness for that mod 5.0 mill costs another several thousand dollars.
So you're going to be in it over 10k for just the engine, harness/eec, shipping, etc. That's 1/3 of the cost of a brand spanking new '11 GT. Then you have to deal with: steering since the '11 uses electronic steering, brakes since your current booster won't fit with the bigger mod engine, AC and heat if you wanted to keep them, possible emissions issues.
Bottom line: Unless you have 10k+ for parts and 10k for labor and you REALLY want to spend that much on your old worn out car making it into a sleeper.... forget that and just buy the '11 GT.