Compression Test Results

Hi all,
Thought I'd run this past the heads on this forum and get a proper opinion. I'm tracking down a miss in my 1973 318 Duster. I replaced the cam a while ago because it was backfiring out the carb horribly and the #6 exhaust lobe turned out to be flat. The miss started immediately after the swap, so I'm inclined to think that its not the cam going again. I think that it was there before the swap, I just couldn't hear it over the machine gun carb backfire. Anyway, I did a compression test because I suspected a valve train problem.

Cylinder: Dry/Wet
1: 100/115
2: 90/115
3: 115/115
4: 115/120
5: 115/couldn't reach
6: 60/70
7: 110/couldn't reach
8: 115/115

Clearly there is a problem with #6. I was thinking that the valves or seats got rocked when the cam went. Whats everyone think?