Big timmy,
I have heard similar stories. I heard he ran in the 9:20s in high school but I did not get a specific time. I know that he was still a runner while working on SNL but I don't know what he does now after his open heart surgery of a few years ago.
In case you didn't remember that story, he had some heart disease and went in for a bypass and apparently the surgeons focused on the wrong vessel to the heart because they said afterwards that he had "unusual anatomy". They had to go back in later and do what was intended.
Amazing that a thin active runner guy as young as Dana Carvey is had that heart trouble. Guess he really got the bad genes in that department.
If I had the desire I'd look up the story for you because I'm sure it's out there, but I just got back from the Ohio State Fair and I'm tired and hot and not up for doing any work today on my day off.