It depends on a few variables, but you're likely looking at about 400-450 maxed out. Typical t04e's usually only go up to about a 58 mm compressor wheel, and that's rated about 450 hp max.
My first turbo was a t04e "54", and I only managed about 400 hp (at the crank) with 8 lbs on a mostly stock cobra motor.
85 ASC McLaren Capri
79 Pace Car