6.2 V8 engine

[t_j]

Yeah at that point throw that money at building up the 5.4. They can be made into beasts (like the 5.4 GT500 motor).

Edit: I believe the transmission is the same for the 5.4 and 6.2. 6R80 isn't it?

Yes but it may have a different bell housing on it, not all 6R80's are made equal, the 2010 6.2 trans is different than all other MY's for example.