Marine Corps Marathon Clydesdale results:
No Oall Fn Ln S Ag Wgt City St Time Net Pace
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114 41 ERIC WYLER M 28 185 WATERTOWN MA 2:47:11 2:47:09 6:23
5237 54 ALEXANDER HETHERINGTON M 49 195 VIENNA VA 2:50:35 2:50:35 6:31
13656 91 THOMAS SCOVEL M 29 185 JACKSONVILLE FL 2:57:57 2:57:38 6:47
6687 115 BRADLEY BROOKS M 22 185 WESTMINSTER MD 3:02:02 3:00:09 6:53
60 118 CHRISTOPHER SPRINGER M 35 195 PORTLAND OR 3:00:28 3:00:24 6:53
25072 136 MATTHEW DENT M 42 190 BALTIMORE MD 3:04:25 3:03:12 7:00
Hetherington ran 2:50 at 195 lbs at age 49. btw, he's in the MCM hall of fame or something like that.
There are a number of marathons that have Clyde categories, some of them have weigh-ins. I'd look there for verified times rather than some Alex Viada type story that's hard to believe.