With the C-6 you won't have enough room. I am presently looking at somewhat of the same problem (mine is just a leaky oil pan gasket on a new engine). I will drain the block of all fluids, unbolt the tranny and torque converter, headers, starter and the motor mounts and just lift the engine enough to clear the pan. It sucks but I will be able to fix it correctly.
Check your local junkyards for the inspection plate on the tranny
Check your local junkyards for the inspection plate on the tranny