Need offset of 5 or 6 speed flywheel face to block for GM 3900 swap

Hi All,

Can anyone help. I need to dimension of the subaru single mass 5 or 6 speed flywheel to block face offset. I am going to swap in a 3900 GM V6 and keep the standard transmission. Sort of like Franksters swap but manual and the 3900 engine.

Unfortunately i started my build thread on nasioc, not here.
Attached is the pic of how i measured. Can someone do the same for the 5 speed single mass and the 6 speed single mass. I hope the flywheel is sticking inside the block not out. The GM's flywheel face sticks out 21mm past the block.