Need a plan - component selection for restoring 68 340 that runs on 91 oct

re-arranging the deck chairs on the Titanic
BTW using stock heads I'm trying to build to get those heads flowing their max at as early a RPM as possible-
getting the valve open to best flow area quick and holding it open then shutting it as late as possible
They will not flow enough for a big cam so you do not get the top end you would expect and loose your low end
Running a 340 cam in a drag class is different as you rev the snot out of it and low low gears so the lack of low end gets offset by some extra HP up top
you are running a race gas or at least the best legal gas and the motor never runs down in the hard working area where the problems occour
this setup is miserable on the street