Will a 350 turbo transmission fit an 85 caprice motor?

No, a TH350 (350 Turbo) transmission will not directly fit a 1985 Caprice without significant modifications. The 1985 Caprice likely used a different transmission, most likely a TH700R4 (a 4-speed automatic) or possibly a 200-4R (another 4-speed automatic, less common in Caprices). The bolt patterns, bellhousing, and overall dimensions are different between a TH350 and these later transmissions. You'd need a custom bellhousing or significant adapter to make it work, and even then, there might be other compatibility issues.