NewArt yes I used one (home made) and its not for security, you need it... unless you have a car hoist, you might be able to do the project in a different sequence with a hoist.
The engine is bollted with the transmission, the only support holding this unit in place is the engine support at the front of the engine and the left and right transmission support.
If you remove the transmission to get at the engine, the engine will only be supported by the front engine support, this is insufficient support. So you have to temporarily support the engine from above (like project nutrod) or below with a jack.
The jack I removed my transmission with was the same jack that I was going to use to lower my engine with, so it becomes a matter of logistics. Logistics of tools as well as space. I went with the support from above.
Below are some home made tools that might help you, let me know if you want measurements.
engine strong back support 2(2x4x60")
steering pump tank syringe with tube
coolant thermostat remover/installer (1 5/8" cooper drain pipe)
car lift pad (hockey puck and 1/2" pipe flange)
