In a nutshell, the SVT engine has been designed to produce more hp - UIM, LIM, TB, heads, cams, exhaust, etc.
If you were considering swapping engines, the 3.0 is the way to go. Visit the 3L forums.
Aesthetically, SVT front, rear, sides, wheels, etc. (Check Aesthetic forums for parts sources).
It really depends on your budget and what your goals are - aesthtic, hp, suspension, etc.
HTH
