Do you know how much main journal crankshaft run out you have? I had similar problems in the past on stock 318 steel cranks, they where bent on the number 2 journal(both, three years apart ) .0018 which with .0022 clearnances would not allow the crank to turn 360 degrees I ended up doing the no no and used scotchbrite to enlarge the bearing clearances I should have taken both in for straighting but I was in a hurry and both of those motors where going into my own cars that me and my wife drove as dailey drivers, both ended up working well for a long time with no problems that I know of, one car got total in a wreck and the other one was sold and went down the road for over 50000 miles before the new owner put a 360 in it