56 chevy mounts

I'm helping out a friend,He's putting a SBC about 400hp in place of the 283 that's in it, it has a 4speed with the cast iron bell housing do you think these stock engine mounts would be good enough or should he up grade if so to what thanks

 

If he decides to upgrade, he'd probably want a scattershield, engine side mounts, and a rear transmission crossmember.

400 hp is about where an upgrade is a good idea