For making power, not sure. Every setup may be different, but general consensus is more pressure is more fuel. As far as safely functioning, the hard parts will handle about anything unless your injectors have problems like stated above.
Pricing on trucks of this age is dictated heavily by the condition, because they can be really bad or really good. Also, the miles and major options such as 4wd, crew cab etc
If the injectors have never been replaced, don't be surprised if it will not hold fuel rail pressure when towing. Famous lbz & lmm symptoms of high injector return rates.
The only way to keep it from happening is to limit rail. I have nailed it down to that via probably ten failed runs at the track and then on the dyno.
But when I asked Andrew about it, he was not aware of an issue but admitted to not having any experience nor interest in running this caliber...
We run 4600 lbz'sfrom Andrew. They equate to 400% he has said. My math puts them at 485%. But he doesn't like to use percentage. Accurate way to measure is the flow rate. On our flow chart, ea injector ranges from 4520 to 4620, hence the model name '4600'.
Our injectors will literally...
I've done a few @ 200k. Solved the low rail issue and the cp3s were still strong as an ox. Anymore, I don't even waste the money to have them tested if it's the right circumstances. Just get all 8