hmm..... the specs(if they are correct) also put it close to a GT3071R....
el cheapo measures 54.1/69.977 on the compressor compared to 53.1/71
that map you posted is NOT a T3-60... it'* a T04E-60.
it does look to flow correctly for an otherwise internally unmodded 3500.
i would look into seeing if you can get replacement turbine and compressor wheels though.