#3. This pic shows another style I've seen but is far less common on 70-early 71 340's, the center wire loom bendable tab is small like the ends, not large and wide as seen in the previous picture (most if not all late 71 340's which are painted blue would have this style cover). For the record I've never seen a set of these on a 1970 340 Six Barrel engine but I wouldn't rule out the possibility just yet.