I know the two of you are interested in this, I simply don't have the time to do the math, but this is what I'd do.
I'd go to
goldsheet.com's historical data page and for each game I'd look at the under over and the point spread.
I would assume that this is the most likely outcome, so if the u/o is 200 and the home team are 6 point faves, I'd guess the score at 103-97.
I'd then see how many teams hit the exact score.
Then you should be able to work out the odds of hitting both.
I'd do this for as many seasons as I could before deciding to rip my hair out and never look at those numbers again (been there, done that, gone mad)
Oh, and if this helped, I'd be interested in knowing the result.
Lori