Tips for starting engine on the ground

So I'm close to getting my cousin's 440 ready to fire up and break in the new cam. My plan is to set it on the ground and hook it up to the old 727 we pulled out of the same car the 440 came from ('72 Polara).

First, if I make sure the transmission is in the Park position, do I still need to have the cooler lines hooked up to keep trans fluid from gushing everywhere? Also do I need to put something in the tailshaft to keep it from spinning around?

Second, electrical stuff... I'm using the Mallory HyFire 6AL that was also in the car with a factory electronic distributor. If I charge up a battery will it have enough juice to run the engine for the 25 minutes I need to break in the cam? If not can I hook up my manual 10-amp charger while the engine is running? I have an alternator but would rather not bolt it on unless I need to.

Last, cooling. I have the new aluminum radiator my cousin is going to use in his car. If I just hook up the rad and use a box fan to push the air through with a container of water to splash it when it gets hot will that suffice? I have the old water pump bolted up of course but an engine fan seems not totally necessary...?