[scottsee]

1, yes, only turbopan with oil retun hole
2, Blacktops are optical and just have better resilution, any 1g cas will work, Non & Turbo models
3, 90-92 turbo T-stat, non turbo dosen't have the extra coolant nipple. 91-92 turbo waterpipe if you're using a water/oil cooled turbo, 90 turbo waterpipe if only oil cooled turbo.

I know there are a couple dedicated forums and websites to this swap, even a very long thread on tuners...