You can not flip it, however, did you try to move the engine over as someone suggested earlier? I had to lift and slide mine couple of times in my 65 before I was happy it was centered properly. The through holes for the large bolts coming from the bottom of the engine mounts are very oversized and offer a lot of movement. Also, was your car originally a six-banger that someone shoehorned a V8 in with "custom" mounts? Hope you solve your problem.