Finding 360 engine/tranny to replace slant six

Update: Wow, didn't expect to actually be buying a 360 this quickly after deciding to get one. But I found what looks like a heck of a deal on one out of an '84 Dodge van. Guy wants $200 for the engine and transmission combo.

He says it's an automatic transmission, so does that mean it's definitely a 727?

I'm planning on a total rebuild of the engine anyway, so as long as the block's not cracked should be ok. Guy thinks the transmission needs to be rebuilt, so not sure if it'd be cheaper to get it rebuilt or search for one that doesn't need rebuilding...