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Will a 350 turbo transmission fit 1992 GMC that has 700R4?

No, a 350 Turbo transmission (a TH350) will not be a direct bolt-in replacement for a 700R4 transmission in a 1992 GMC. While both are automatic transmissions, they have different bellhousing bolt patterns, different lengths, and different output shaft configurations. You'd need significant modifications, including potentially a new adapter plate and driveshaft, to make it work, and it's generally not considered a practical swap. Sticking with a 700R4 or its equivalent (4L60E) is far simpler and more cost-effective.