Re: 350 LT1 compression...Lower it?
Jim, when you say the 'stockers were .020 compressed' were you referring to the steel shim gaskets? I reinstalled the steel shim gaskets on mine, I think they were .018'ish ??
I think Keith is right, these cams bleed off a lot of the cylinder pressure so pinging is not too big of a problem - especially if you turn the timing back a little. I found that running 93 and turning the timing back a bit significantly altered the 'seat of the pants' performance, but... could've been in my head 
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Marlin
70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride)
69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride)
67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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