In Full Size Chevys, they made Talls and Shorts. The mounts in the pictures above, look like the Short ones, which are more rare. Seems like the Talls and Shorts were more '67 -'70, but that is just in my experiences. Strangely, I have had 2 '69's, side by side, both original Small Blocks and one had the Talls and the other Shorts.
-Parting Out over 75 '58 to '73 Full Size Chevy Cars-
-National Impala Association
-Vintage Chevrolet Club of America