Chevy 6...timing issue?

...and no dice. Same symptoms. Initial timing set at 10*, and the thing runs like a dog. Took some cell videos while driving that I'll try to get posted later today. Grr.

Bubba, I might just be sending you that distributor!

 

Thought I'd post this prior to going any further. Towards the end, you can really hear the stutter ( more like a knock in the ****py audio quality here)...but you get the idea.

The running conditions: 3rd gear, accelerating from about 30MPH to 50MPH, with no more than half throttle.

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I'm happy to report the issue is resolved.

Went in to double check valve adjustments (hydraulic lifters on this motor, btw), and when I pulled the plugs, 4 of them had cracked insulators. Replaced them, and whaddaya know...the motor runs great! It's good to have my friend healthy again.

Thanks to everyone for your help, advice, and general knowledge.