Did you purchase a LS1 T56 or an LT1 T56? The LS1 T56 is not a direct bolt up to your engine. The flexplate, clutch, throw out bearing, input shaft and mid plate are different. The bellhousing will bolt up, but the clutch action won't work without heavy modifications.
The best route is to find an LT1 (1997 and earlier) T56.
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