I have seen a '66 with a 460, so I am positive you can fit a 428 in a 67(same basic engine as the 390 after all). As to whether you should do it...that depends...your handling will suffer for sure...and you will want to add some type of shock tower to cowl bracing for the extra weight. Is it worth the extra torque and terrible mileage? I would say no...just add a turbo or SC to get both those things without as much extra weight and fewer fitment problems. I would sell that 428 to someone restoring a big block car at a good profit.