I am not familiar with any difference in the motor mount design. The Nova and Camaro have different motor mounts that moves a BBC to the passenger side to allow for more room to install the big engine in a small car. But the Chevelle and the full size use the same mounts for the SBC and he BBC engines as the motor stays centered. This difference in the Camaro motor mounts fuels a lot of the talk on the internet about there being a difference in the motor mounts.
A BBC will not break a SBC motor mount, so it isn't about strength but it's dimensions that you have to worry about. Newer cars have a lower hood and swept back windshields to reduce air resistance in an attempt to gain mileage to meet federally mandated CAFE numbers. The newer mounts are not different in strength from an older one; but probably lower the motor more, which may interfere with the damper contacting the front sway bar.