Thanks for your trouble, megan.
The engine pictured on the Stearman on the TCT website isn't a Continental R-670.
At a quick look, I'd originally assumed it to be a Wasp Junior, that being the most common retro-fit.
Looking at the relatively small pic on the website a little more closely, though, it now looks to me to be more like a Lycoming.
The pushrod-tube mounts at the crankcase end would be the clue there, I think.
Anyway, just an interesting diversion.
BTW, it'd be interesting to hear of your over-water jobs relying on just one of Mr Lycoming's products.
.