Unless something bad happened to the cam spindles or drive gear in the crank or the drive shaft protruding from the flywheel, the new cam gears aren't true and round. Try a different set if you don't have a way to check them with dial gauges. Do you still have the old cams?
You could also remove the intake cam to see if that isolates the problem. If it still binds with only the exhaust cam, maybe that's the culprit. If it's a problem with the actual crankshaft or primary gear, it should get tight twice per revolution of the crank.
In the picture it looks like the exhaust cam teeth are barely engaging the primary, maybe this just the angle the picture was taken from? Some Prussian Blue is useful to check tooth engagement.