Gas 50 Help Help Help

WE have been parting out a Cat gas 50, and have run into a road block.
The engine has been stripped down to the block and crank. The question is how do you separate the engine from the the transmission. we removed all the bolts, but the block will only move out about 3/8ths of an inch. It acts like the transmission input shaft spline are stuck to the clutch.
Don

Thank you;🥱
Who ever called me at 6AM yesterday morning. After looking through the upper and lower inspection plates we could see what we missed. Even though the engine is supported by a jack and hanging on a chain, for safety, we will put a couple of the bolts back in the bell housing, then remove the clutch coupler bolts. should do the trick.
Oh by the way it is a good clutch if some one is need of a gas 50 clutch.