Warwagons 318 mounts are the same as your 273's. 360's have a different ear arrangement on the block. The old Direct Connection Chassis manual had a little drawing in it that showed how to modify your existing brackets. If I remember correctly only one had to be modified, the other was useable as is. Going from memory here so maybe someone with the DC manuals can confirm/correct as necessary. There will be no factory bracket for a 360 and your 68 "B" body K frame. Schumacher is also an alternative.