ok here's the deal... in less than 2 months I wanna drop a 383 in my car... between 350-400 hp... I want to change my diff as well... I heard it is possible to just change the gears in it? should I do that or take a stronger diff? is it hard to open that diff? and what about the driveshaft? is the stock one can hold to that?

for the gears, any suggestion? I want a locked diff... and gears that won't make my engine rev at 6000 on the highway..

thanks guys... I know nothing about drivetrain