What year 360's have the "thicker bore"

The only ones I know of are supposed to be cast before the end of '71. So casting dates of 70-71 "should be" assuming they are not core shifted. I have only tested one, dated 6/71, and it was shifted and no better than anything else later or Magnum. The best and most consistent castings I've found have been the 80s vintage LA 360s, the later the better. I've also heard the later ones got better iron, but are thinner. Magnums would reinforce that IMO. They seem pretty good and don't wear much.