727's should take 700 hp all day long as long as you aren't pulling a 15,000 pound trailer with it. In a car it's a piece of cake.
There is some good stuff mentioned in this thread but man is most of it overkill. You have to remember it's not just the power the engine produces that affects the longevity of the parts, it's also the vehicles usage and weight. A 3000 pound car with 700 hp will not be nearly as hard on the drivetrain as a 4000 pound car with 700 hp, or a 7000 pound truck with 400 hp.
My little nearly stock 904 has endured 600 hp with a transbrake for years and never failed in a 3000 pound car. Why in the world a near stock 727 wouldn't take another 100 hp is beyond me. It should easily take nearly double that.
