I'm looking for another Mustang, and have found one I'm interested in. Unfortunately, the owner bought the car two years ago and has no idea where the 351 in it came from. He does know that it is mated to a c6 auto transmission.
Can anyone tell by the picture what 351 is in the car?
As LockNLoad said, definitely Windsor. Whether or not it's a 351 or a 302 will be told be the casting numbers. Check the headers and oil pan as well. If they are aftermarket there's a chance it's a 351, especially the oil pan. Both headers and oil pan need to be swapped to aftermarket offerings to be put in a fox for clearance issues.