D.Hearne said:Nothing physically larger than a 351C will fit under the hood and between the shock towers in a 65-66 Stang. Replacing them with ones from a 67-70 won't do it either, the track width of the 67-70's was widened to fit the FE big blocks in them. Now, if you remove the shock towers and add something like a Mustang II front suspension, anything will fit there, Mod motors included.