who have matched have very few honors besides their derm rotations, but have probably made up for it with board scores, research, recs, intangibles, etc. Some who have honors in nearly everything don't match.
But for the most people of course, the more the better, especially since a very strong 3rd year goes a long way towards AOA, which is very helpful, but not a must/guarantee. If you can't get AOA, then your class rank/specific grades in rotations would probably come more into play, and Honors in core rotations like Medicine are definitely helpful.
From what I know, there really aren't any absolutes or exact numbers, and the process varies from unpredictable to crapshoot. Still, most (but not all) people who are successful have more Honors (preclinical and clinical) than not.