my guess is the cam snapped between the next to last journal and the first lobe for cylinder 7, or even between the cyl 7 lobes.
With the bark coming out of the carb, my guess it you have an intake valve stuck open. When you crank for a compression check, open the throttle blades and check for air coming back through the carb. You can also check the tail pipe as well. you may feel (at either location) alternating vacuum and pressure.