340 engine mount bracket

Don’t know if possible in your case, but I would be inclined to modify just my own single 273 mount, rather than buying a pair of 318 mounts, and still having to modify one side anyway.
I thought about that but the mod to the 318 bracket looks much easier than the mod to my 273 bracket. I really hate the idea I have to mod anything because the drivers side seems like the one that has to handle the engine power more than the passenger side, and the motor I'm putting in should make 450 horse. And I don't weld very well...lol. But the 318 bracket just needs the tab welded on, and that should be easy to weld. Well, easy'ish...