I went to look at this cougar today cause my buddy wants the car and I WANT THE CLEVELAND....... anyways I looked at the motor and it has the little no. 4 in the corner of the heads and the heads look like cleveland heads, but do all cleveland blocks look alike ? A 400 m has the ridge in the top of the block by the distributor and this does not . in the area by the distributor it just looks a little different than the other 2 clevelands that I have. could it be a 351m ? Does the 351m have a block that resembles the cleveland ? like I said, the heads have the little no. 4 in the corners so I think they are at least 4v 351c heads.