Magnum 300 crate engine - how should it go when tuned up right?

The G tech tells the tale. You have what 300 gross horsepower feels like in a 40 year old 3600lbs car. The Mustang is 460 net hp, with extra gears in the transmission. You need another 100hp and more gears to equate those cars. But - the A body will turn heads. Nobody gives a **** about another Mustang.