Here is a chart of sea level torque at 29" MP for C-85, C-90, O-200, 9.5 O-200, and 10.5 O-200 for varying rpm. Stock O-200 is in red and stock C-90 is in blue. Stock C-85 is yellow. Note the bad Continental data point for the C-90 at 2350 rpm, and note the similarity in shape of the curve between the C-85 and O-200.
Also, a chart of C-90 vs O-200 horsepower at 2750 rpm and varying manifold pressure. The crossover point is 21" Hg (about 9500 feet pressure altitude).
As an aside, based on piston pin height, C-85 pistons in an 85 stroker or O-200 will give a compression ratio of 8.68:1. Caution -- unchamphered 85 pistons will strike the heads in some older cylinders. I prefer the NFS 9.5's from Lycon, but Lycon tells me they sell more NFS 9.0's.
Edit - I know of one guy who ground the O-200 heads back to clear the top of the 85 pistons (had head strikes on 2 of 4 cylinders and evidence of the top rings topping the steel barrels. After the head work, he had a top ring overtop the barrel and hang between it and the head. Said he had a heckuva time getting the piston out of the cylinder.