Simple - If it works for you - don't fix it!
Some older, or repainted vehicles no longer have the underhood label. A quick call to a dealership usually results in what they use successfully, unless it's a real old or or no longer made vehicle. Finding out what the best plug for a 1937 Vauxhaul wouldn't be easy.
The OP said he had a problem - the same problem that so many have experienced with Bosch plugs. I was trying to save him from all the work and expense of replacing a fuel pump when it's very likely the problem stems from the Bosch plugs, even if they are new.
Plain old plugs may not last near forever, but they seem to work the best over all the "trick" and performance plugs.
Someone recommended getting and using a fuel pressure gauge before arbitrarily replacing the fuel pump too. That too would be a good move.
"""""i see a lot of posts on this forum about using what is recommended under the hood, why doesnt someone just say what is recommended instead of acting like that?"""""
It would be nice - but the recommended plugs on the labels have changed over the years, 4 cyl, 6 cyl, emission equipment also varies from state to state. The label on THAT PARTICULAR VEHICLE is the best way to get the right ones.
"""""the best that can be offered is experience because opinions are useless. """""
That's my opinion - based on many years of experience owning repair shops.
If it isn't broken -- don't fix it!