Is it possible for 318 to run with dist. 180 deg. off ???

You could also set your timing to max vacuum. Then check timing marks. When setting timing using the max vacuum method, you will typically need to retard it a few degrees to avoid detonation under load. I usually set my timing using this method and go for a ride. If detonation occurs I will retard it a couple degrees. If no detonation occurs I will add a couple degrees until I find the sweet spot. 65'