GT3082r would be safer bet to compare against a 60-1. I went gt3582 on my car, though I kinda regret it and am now looking at getting a precision billet turbo now, those things are so sexy.
The 3082 is sexy, has the turbine of a 30 and compressor of a 40. Like a ballbearing/water cooled t3/t4Oe, kinda. More in line with your car's displacement and goal and will spool like hell. Its capable of supporting 550hp, too.