WINDSOR HEADS

it wouldnt change that signature mustang sound, But then again 351's sound badass :) so who cares. Anyways it wouldnt be the best choice for heads, and in my opinion if your going to go through the hassle of swapping out your heads it might be for a set of good ones. So lok around for some used gt40's or trickflows. The power gained with one of these would be triple that of a 351windsor head.
 
Those trickflows, im guessing twisted wedges or something, would gain MUCH more than those 351 castings and gt-40 castings for that matter. Atleast those cheap iron used gt-40's off explorers and the like. Plus the aluminum casting is like 40lbs lighter or something.