Nitrous What else?
I wrote a letter to KB-pistons on this subject a couple of years ago, they said go for it, make sure your not going lean and retard your timing. Of course they are selling parts and not worried to much amount how costly a melt down could be. I asked about a 200 hp shot, they didn't seem to concerned..
Mac. 
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393,9.5" 351W,830 Holley,Victor Jr,Home made Cool Air Pan,
Pro Billet MSD,
MSD 6AL,
XE 284H Xtr-Com cam,
240-246 @.050,
540-544,
M/T Et streets,
Mac Upper and Lower, Control Arms,
3:73 US Gear,Mini Spool,
Eagle Long rods,
Mac Windage tray,
KB Pistons,
Scat crank,
4000 rpm stall convertor,
C-4 trans,
Airflow Research 185cc,
Hooker long tubes 3", exhaust,
S&W 6 point roll cage,
11.2 at 121 mph.
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