Mike be careful using 340's for detail references when doing a 318, plenty of variables between them and 318's as well as plenty of variables between 70's and 71's. FWIW I was one of the O.E. Judges who judged the orange Demon at Vegas, it was very nice and scored a Silver in it's class (Survivor) but the top end of the engine had some restoration repairs done due to what was believed to be a small carb fire in it's past, accordingly It's not 100% untouched original under the hood.

You may find it difficult to find 100% original/survivor 1970 318 photos in any kind of short time span mainly (sadly) due to lack of interest in getting good details from them and because so many were modified, had engine swaps, or simply don't exist anymore.