If you want torque go with a 392ci stroker but if you just want a fast car a stock 225 hp 5.0 in a Cobra will outrun almost any production car out there.
Most people say anything over 350 HP is hard to harness in a short wheelbase and lightweight Cobra.
For What it is worth most people seem disapointed when I tell them it is a 302 but when they go for a ride they swear I am lying.
I have had to open the hood and show them the little bitty motor to prove it is a 302.
A 405hp Corvette Z06 has about 3300# to haul around or about 8.15# per HP. In a 2400# Cobra all you need is 295HP to keep up.