Where's Dodge in Nascar???

Yea, I thought about that? There are V8 toyota's and they are kicking the SH(& out of Dodge!!! They build toyota's in america(assemble). I guess they deserve to be there and i'm just rootin for a 3 legged horse and don't like it!! I am A Mopar Man Bloods blue!. Go Kurt Busch!!! Are only one hope!
What are the rules on the engines??/
Is Dodge running a Dodge and Chevy a chevy engine or are all the engines pretty much aftermarket blocks with out Automotive brand identity? ie: Merlin Block ect....