I'm positive. The 03-04 Cobras have an Iron block and aluminum heads.
Taken from the SVT FAQ....
What are the differences between the 2003 Cobra and the 2001 Cobra?
Mechanically, the 2003ís have a 112 c.i. Eaton supercharger, intercooler, intercooler reservoir, slightly different heads and cams, 8.5:1 compression, forged pistons and Manley H-beam rods, an Iron block, Tremec T-56 transmission, 3.55:1 rear gears, and stronger half-shafts