the frame is the same on all 67 to 72 i believe , the front half of the frame is even the same up to 79.the i6 had a little bit taller tower than the v8's but i've done three v8 swaps to the i6 towers with no problems when i relocated them to the back set of holes. i think they changed the towers also for the 351 modified and the 400. it's just a pain finding a oil pan for those engines .