Since this is a sticky thread, I will update it with what I did and used to set the cam retard offset just in case someone is searching.
I couldn't get truck to start one day after have driven it the previous day. Counting my blessing as this happened in my driveway at home. Went through all normal diagnosis: spark, fuel, compression, etc. This is a stock vortec 5.7 in a 1996 K1500 Silverado with over 180k. PCM was NOT showing a code
Upon inspection of plugs, wires, cap, and rotor I found about 10* of rotational play in distributor. Probably not the problem but repairing/replacing before it becomes a problem. Sure enough the distributor gear was showing unacceptable wear. Cap and rotor didn't look that bad. Couldn't find a melonized gear in stock anywhere local so opted for a Spectra Premium GM01 from Oriellys down the street in stock. It will end up being a spare when I rebuild the original because I don't trust the parts these aftermarket units. This one had the aluminum body though and a new cast iron gear.
Assured #1 cyl. @ tdc on compression stroke and rotor pointing at #1 spark tower, marked distributor body and intake manifold and guesstimated the mark onto the new dizzy to find a ballpark which ended up being pretty close.
I have the BAFX Bluetooth adapter for $16 on Amazon:
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I purchased DashCommand off Google Play for $10 and the extended GM PID's from Palmer Performance (within the app) for an additional $10:
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For good measure and another tool (but not necessary just looks cool and is handy) I purchased Torque Pro off of Google Play also and set it so I could read it through the windshield from outside the truck:
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As you can see, I'm not plugged in but everything works in the DashCommand application and I have a reading of -6* on cam retard offset @ 1100 rpm. I have yet to try the Torque Pro app but looks cool doesn't it?
Now I have a running truck that I can pull in the heated garage (19* in Ohio in January) and continue my diagnostic into what happened and why and what else can I do to improve the engine.
I hope this helps someone.