The mod motors are wide because the height of the heads are huge since the cams sit on top. The V8's you speak of above from Ford are ALL 90 degrees. In fact, I can't think of any V8 (Ford, GM, Chrysler...) that isn't 90 deg. Not sure about the small V8s like the SHO and the LS for example. The term "big block" and "smal block" are old school terms and really don't apply to the modular motors.