I'm not doubting how good the 86 draft was for the 49ers. You make good arguments and in terms of depth it was actually rather awesome. But I will just respectfully disagree with your position that its on par with the 74 Steelers.
Personally, I think Webster and Lambert are the two best players of those two drafts combined. Then you could debate Swann vs. Haley for #3 and #4. But that's only my opinion and definitely is subject to debate.
Also, I don't think Haley's 5 trips to the SB are distinctive since I believe all four of the Steelers went to 4 SBs. Regardless, # of SBs isn't really a measure of the player, is it?
FWIW, nfl.com ranked them here: http://www.nfl.com/draft/story?id=09...o&confirm=true
49ers came out #5 but since they combined the Cowboys 91/92 drafts, it probably should be #4.