what size are the ar's in my rhc7 ihi turbocharger

I have two rhc7 ihi turbochargers and wondering how you tell what ar parts are in them?
Balanced and have oil cooling. I haven't been able to locate the build sheet , but will keep looking.
part number is 007T-541 on one sheet I found.
Turbo's part is PO.6634, both
turbo spec is 13v61150,
both serial number is rhc7-2090112 rhc7-2090106

heres what i believe they are by using turbo calculations

compressor wheel
inducer=57.15mm exducer=81.91mm

57.15mm sq / 81.91mm sd = 49 trim

turbin wheel
exducer(inner edge)=62.61mm inducer =73.66

62.61mm sq / 73.66 mm sq = 72 trim

compressor housing
2.27 inches of area / 3.31 radius = .69 ar

turbin housing
2.16 inches of area / 1.285 radius = 1.68 ar


Is this correct?
I can's find what it came off of. I believe it was a overseas venture between ihi in the states and overseas, japan. It was made here in Shelbyville, Illinois. But they can't tell me what it was for. It was built for me a few years back for a 468 bbc, as a favor for some parts I traded. The exhuast flange is a pain in the but. It has to be pressed in and then welded, odd ball can of worms. No mounting bolts what so ever. So I have to custom make the exhuast outlet. I have some pics of it here, http://groups.msn.com/altereddoug/shoebox.msnw, of the turbochargers