Unequivocally I recommend the 2004r. My rule of thumb is Powerglides are for track-only cars that weigh less than 3000 lbs with more than 600 hp. Or, for an original restoration, but I would think long and hard about that one. On the street, with 450hp or less - 2004r. Above that - 4l80e. Of course, these choices require more setup, and cost more, but to have a car you can really use I think you have to invest in driveability and in no place is it more important than in the transmission. Well, except for the brakes.
