It is highly likely the P0100 is related to damaged wiring in the MAF loom. Search that and you'll see more on this.
True, not likely the new cam follower is at fault for the P0087 and P0310B codes. It is more likely to be the intake cam's tri-lobe is worn at its peaks...or the pressure regulator-N276 on top of the HPFP has failed or been damaged/cracked. It is slightly possible the pressure regulator codes are due to pressure made on the low side from a weak LPFP or clogged or incorrect filter. Another slight possible reason may be the high pressure sensor-G410 itself has failed...it is mounted on the fuel rail.
How you go about this will be up to you to decide. The MAF codes appear after the fueling codes, so I do not believe the fuel codes are resultant to the poor MAF signal. I personally would inspect the pressure regulator-N276 for damage/crack and the intake cam's tri-lobe for wear. Then, you need to sort out the G410 pressure sensor on the rail. Either have it tested or simply replace it. If nothing turns up...then look to the low pressure system, but this is not likely to be the cause as the low pressure sensor isn't detection an inefficiency.
Inspect the MAF wiring for damage...will need to remove the protective tubing for this.
Post your progress.
