did you ever swap the motor is my question lol. because i have a 2014 sliverado that had a 5.3 in it but i swapped it with 2016 6.2. i installed a 235/239 TSP cam shaft with long tube headers, full stainless exhaust, and 2600-2800 stall. im having issues with the cam position senor codes. P0340 P0341. i've changed the senors, i've torn the motor back down to see if something was wrong internally but nothing is wrong. everything looks good just cant figure this issue out. maybe some one can help. also its been to a dyno shop and he's telling me the cam is advanced but its not.