At 12.5 pounds of pressure there isn’t a needle and seat package in this world that will shut the fuel off. If the pressure is that high, get the engine running and look into the carb, if fuel isn’t gushing out of the boosters and blowing out the vent tubes, your gauge is garbage.
Start with that so you have a answer for that. Unless you used a junk, new car synthetic, synthetic oil didn’t kill your cam.
If you did use some off the shelf, low grade oil then that’s why the cam failed. The base oil didn’t have a thing to do with it.