Is my engine dead?

thanks for the replies so far!

I feel silly asking these questions as I've been building engines since I was 16.

I got it running last night- however I had to turn the distributor so far counterclockwise that the vac advance housing touches the manifold.
And the timing mark is showing waaay down on the balancer with a timing light still.
It sounds like a diesel engine running, but maybe mechanical interference? When I put a screwdriver up to the valve cover it's silent but the engine itself is super loud...?

me thinks the timing chain jumped, but I just need to verify before pulling it apart. I didn't want to put a ton of work into this engine as it's basically going to be a plow truck with trailer pulling duties occasionally.