You're gonna need to do A LOT more than shave those 96's to get an honest 450-500 ponies out of them.....a flow of 260cfm would be minimum for a true 450 ++ HP.......I believe Cliff Ruggles ran a RAIV clone cam at 230/240 into the 11's.......that would be the minimum duration for the HP you want......that 2500 stall might be a bit tight also.....
The easy way to get what you want is to ditch those heads and go with a good flowing aluminum head.......
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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