Gmc - Sonoma :: 1996 - Engine Shakes Badly And Struggles To Run / Timing Is Way Off

I have a 1996 GMC Sonoma extended cab, 2.2l engine (not vortec) purchased in the United States. I’m having trouble setting the timing correctly.

I recently replaced the camshaft and crankshaft sprockets and chain, and after several attempts to set the timing, the engine still shakes badly and struggles to run smoothly, especially at idle. (It did not do this before the repair.) My code reader picks up the following codes: P0106, P0108. It seems to me that the timing is off despite my best efforts.

I’m going to try and attach a picture of the timing chain and sprockets as they’re currently set because the camshaft timing mark is strange on this vehicle and I’m not sure if it’s lined up correctly. Does it looks right? (Red mark on cam sprocket made by me; timing mark is supposedly the circular hole above that tooth.)

I did several other repairs at the same time that I did the timing. I have gone back over as much of these as possible and I don’t think I did anything wrong. As cars go I’m strictly an amateur but I work as a small engine mechanic so I have some experience with the way things feel when they’re done wrong. Nevertheless, if the timing is right, maybe I botched one of these?

The simultaneous repairs:

Removed head
Replaced hydraulic lifters
Cleaned carbon off valves
Checked pushrod straightness
Changed gaskets (several)
Replaced oil pressure sensor, coolant temp sensor, & thermostat
Replaced coolant hoses

I did all this because I hit the 150,000-mile mark and I want to keep it running for another 150,000.