http://freepdfhosting.com/9bf6f248cd.pdf .
Here's a Powerlifting USA page with the #242 rankings for 3/93 through 2/94 -
O'hearn at #94 in the squat, not ranked on the bench, #23 deadlift, and #76 for total.
Looks like someone transposed the numbers on that page too, #1708, should probably be #1807 which would make him a lower 30's ranked on total lifter.
As SuperTed mentioned, the Powerlifting meet I can find for him is 1993 California ADFPA on 3/13/1993. He won the #242 class with a #650 Squat, #705 Deadlift, and a #452 Bench. It was witnessed by a decent amount of legitimate California lifters, and judges.
Mike fudges his stuff by going to smaller meets, and belonging to smaller organizations, etc...., but he does seem to do much of what he says.