Tman, I will try my best to answer and questions I may have created.
look into 169012 BW turbos they are extremely cheap new, compressors can be modified and they have optional turbine housings.
Compressor 63.5mm in 91.4mm exd
Turbine 83.5mm in 74.0mm exd with a 110 A/R housing
I guess these BWs that are normally on 60 series 11.1L and 12.7 L engs are really cheap and cores are so plentiful because so many just buy new ones instead of rebuilding them.
The turbo guys love to sell these things aparently because with the small 64MM compressor inducer and the fairly large turbine it is fairly hard to get these into surge with a smaller eng. and they will still produce 50-70 pounds per minute, with the right displacement combo.
On a 325 cuin with a 67 inducer a pair of these will deliver over 100ppm with a compressor exit temp. of 375 deg. a B'ville on a 90 deg.