Part of the reason for the name "Doubler". Originally, this was a real-deal 396/325hp with a TH400 3 speed transmission.
As these are not numbers matching (correct YOM, though), today I received a nice shiny new LT4 with a 8L90E.
Lets see...
325hp ... 650hp -- yep, double.
3 speed trans ... 8 speed trans. Over achiever.
The target is to double the stopping power, going from drums on all four corners and double the cornering.