Another alternative would be to move the pivot point of the a/c unit to the left an inch and a half (when viewed in the 1st photo above -towards the direction of the centre of the engine). Obviously this would involve cutting the plate brackets to a more triangular shape and redrilling holes for the pivot closer to heavy bracket that mounts off the head. Not sure if I've explained that too well, bit of cutting and cleaning up surfaces etc but will give clearance