Looks good from whT I seen. looks like they hit somthing in the center but all that can be fixed.
Like Thierry said, does it have alot of rust or not.
If they car is a 351 2-V Windsor motor it should have a H in the first few spots in the vin. does it still have the plate in the drivers door?
But Im with you, the Mach is fine but the 351 boss would be great and even if you get the motor and its not what came out I would still show off the Boss motor in it