alum LD4B intake and big block adjustable rockers both ec

That D4B will work on your 318. You will have to rat the holes out a little, because they are smaller holes that matched the early 273's. I put one on a 71 318, and made the holes bigger. It worked well with the small Comp cam I put in the 318. The bolt holes on the above intake appear to have not been messed with. Early A guys with a 273 might love that uncut intake. This intake can be made to work for your 318, but you are correct in the fact that a LD4B would bolt right up.