Mercedes-Benz: 350 SLC Timing Chain Slack

My '75 350 slc Euro lost power and started making a horrible clacking noise.
I checked compression. cylinders 1 thru 4 175PSI 5=0 PSI 6=90 PSI 7&8=0 PSI.
Removed the valve cover to find a considerable bit of chain slack.

Is the 350 V8 an Intereference engine?
If so, is it possible that I just skipped a tooth or 2 and didn't damage valves?

Can anyone explain cylinder 6 having some compression while 5, 7, & 8 have None?

Where should I go from here?

Thanks for any help.

-Conrad

>Is the 350 V8 an Intereference engine? 

You bent some valves on the left head.
Bill Ditmire
Ditmire Motorworks,Inc.
425 White Horse Pike
Absecon,NJ 08201
http://www.ditmire.com
609-641-3392