340 in a 65 Barracuda
Put the passenger side 273 bracket up to the 340 passenger side ears. Easy to see that the 273 bracket has two holes in the rear, one in the front. Just add the piece shown above so that you have two holes in the front part of the bracket. Here's mine, not a clear picture as it was difficult to squeeze the camera down there, but maybe you can see the addition I welded to it well enough.
Driver's side is easy, just slip a few washers in if you don't want to be bothered making an actual spacer.
Put the passenger side 273 bracket up to the 340 passenger side ears. Easy to see that the 273 bracket has two holes in the rear, one in the front. Just add the piece shown above so that you have two holes in the front part of the bracket. Here's mine, not a clear picture as it was difficult to squeeze the camera down there, but maybe you can see the addition I welded to it well enough.
Driver's side is easy, just slip a few washers in if you don't want to be bothered making an actual spacer.