Good quality spacers work great. My neighbor has them on his duramax for the same reason. He is constantly hauling tractors and large loads, probably has had them on for 5ish years.
I would double check the title vs the vin tag. It’s possible that it’s a typo. I had it happen before on a corvette, didn’t even realize it until I sold it.
Reality is that we are not racing a 500ci pro stock where every HP counts. If you want to flip your lid go ahead, want to put a nice open element breather go ahead. The fuel spray(along with other things) from a tbi acts the same as a carb, it will cool your IAT hints why a lot of blow through...
I can’t even get the tires on my suburban to break loose by power braking. But my 92 will do burnouts for distance. Everybody wants to do a smokey burnout every now and then.
Probably one of the best high production engine rebuilders. My 92 swb has a jasper reman 350, it got installed in the late 90s, it’s still going strong.
Don’t worry about the tires they will be fine. It usually take a few coats, spray it on and you will see the clear coat start to bubble after several minutes. Wash them with the pressure washer and repeat.