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Are the heads ported and what rpm do you trap at now..
and are you happy with the rpm... do you want to go up
in rpm..which you will unless you change gear ratio
yes they have been 346 on intake and 236 on exhaust or somewhere around there sheets in the basement...shift at 6500 rpm going thru traps about 6700 rpm 
71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's
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