I won't argue any of the slant nose comments cause I simply don't know enough about those cars but for the Ford products...
Look at a Tallagdega (street or NASCAR race car) vs. the standard Torino. You'll see that Ford moved the grill and headlights forward to meet the leading edge of the car (well, ok, they also added a little "slant" section in front of the hood) in order to minimize the concavity of the front end and allow air to go around the car that was not needed for cooling the engine. They also did a cool "trick" by using a rear bumper on the front because it was shaped better than the standard front bumper, as far as aero was concerned
ORIGINAL: epegasus
The slant nose design had less to do with aerodynamics and everything to do with front end down force. What has the greatest influence on how slick a car moves through the air is over-all frontal area. Take a picture of the front of a car from a dead-on front angle from about the height of the hood's leading edge. the smaller the car from that perspective the easier it will displace air and the faster it can go. The slant noses actually hurt the top end performance but had to be there to keep the noses from floating off the track. The sunken front can generate a high pressure zone but that is easily dealt with by well placed pressure relief cut-outs that allow the high pressure air to be funneled to low pressure zones.
ORIGINAL: mot250
... Talledega Torinos and why there were the pointed nosed and big winged SuperBees in the late 60s early 70s before NASCAR outlawed them. Even the 05 to 09 Mustang front end is a brick compared to the cars run in NASCAR.
But yeah, I sure would love to see new Mustangs, Camaros and Challengers (not necessarily in that order) running together on some road coarses again.