Precision E series compressor cover.
61.4 mm inducer, 82mm exducer, GT35R compressor wheel.
2.759" inducer, 2.437" exducer, Garrett T-350 turbine wheel.
This turbo is rated to support 630 flywheel hp. It has pushed full weight Turbo Buicks into the low 11's, some into the high 10's with boost levels of 25-30psi. So I would say real world rwhp numbers would be in the 500-550 range.
It has been displaced by the new Billet 6262 turbo.
HTH