Could i win a race over a 2006 mustang convertible (not GT) with this setup?
First, your mods haven't made you gain as much power as you think they have.
Secondly, even the 240hp superchagerd Regal GS is over 1/2 slower than a Mustang V6 to 60mph.
Thirdly, in a drag race, fwd cars like yours aren't very good at putting the power down; the rwd Mustang does not have this problem.
The Mustang also has vastly superior brakes and handling and would leave your car for dead in a road race..