LA / Magnum blocks

Any real advantage would be thicker cylinder walls, decks, or stronger web or caps. I don't know of any of these advantages to either, except if the early 318 is true. They are all high nickel castings and a good place to start. I have little experience with anything past 1975. I view them all as the same 273, 318, 340, 360, 5.2, or 5.9. They all have different pluses and minuses, and slightly different characters. Some have better parts, but it matters little with the current price of 360 heads or aftermarket heads. Do you know what do you want? What is available to you?