putting in a 318 in my 66 A-body

Over the weekend, I was offered a free 318 out of a 89 Dodge van with auto transmission. I am currently installing a super six setup, but giving seroius thought of going for it. figures.

What do I need to do/prepare to successfully install this 318?
Does anyone know if the 318 in 89 had a 4 speed auto trans?
If so will it fit in my 66 Valiant?
Do I have to beef up the front end?
Do I have to install a larger radiator?
If I install this trans, do I need a new cross member?
So many questions...........:read2: