pulling a slant 6 out without the tranny attached

It is easier to remove tha transmission first and then the engine. It is also a lot easier when installing to put the engine in first and then the transmission.

If you are set on leaving the transmission in the car make shure to support the front end of the transmission. In a suitable location put some kind of clamp to keep the converter from coming out. It is very easy to destroy the small tabs driving the oilpump in the transsmission if the converter is not in the correct position when pushed in. This can happen if the converter is not fully in when mating engine and trans.
Remove all bolts that connect engine and trans, raise engine with a hoist, add support under front end of trans move engine forward. Use a prybar to get engine and trans apart, should not take to much effort if trans is supported.

Reverse for installation. However it takes more work to match upp engine and trans.