Boost thresh points...

i been reading alot and most of the post are old all over the net. i was wondering what the boost level limits are on say a stock 5.3 , 6.0 . vs say one with heads and cam, stock head bolts, vs arp head studs. 91 oct, 93 oct, e85. and how much meth will help?

from what ive seen. say a 5.3 stock and reliable say 8-10 psi. then ud need push rods and springs?

12 - 13 psi with stock head bolts and 91 oct. " meth wouldnt hurt"

14-17 ish if you have arp head bolts and 93 oct

17+ with 93 and meth, or e85, or a mix ? just trying to broden my knowledge and maybe set up a future build.