yeah, why the heck would he 'pull' valve timing, if he could? You can do cam gears but that doesn't matter by psi, just boosted or n/a.

bagged - there's no correct answer, it all depends on the setup. Your exhaust/intake manifold design, pistons, AFR, octane, blah blah blah all influence it. I've read people running as low as 8* but as high as 20*. Best way is doing some dyno tuning with a scope or det cans if you don't have a fancy aftermarket knock sensor.

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'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi