A/r ratios Please help What are they for 84-7 t-type and Gn

[ng8264723]

I am plannin on a twin turbocharger project. I would like the a/r ratios for the garrets that were in various Buicks. I was told that 82 up had .63 exhaust. What about the intake size. The 84-5 intake side looks much smaller than the 86-7. Anyone have info on this
thanks
chris

 

[1of1547]

The stock compressor housing has .6 a/r cast into it.