You dont state the stall on the conv.. but if
you dont advance that cam you will be slower...
you need all the help you can down low in the RPM
and your headers are big for it... whats your max RPM
when you cross the line.. and what gear are you in..
if your in high gear I expect you have low RPM
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I didn't state stall because I don't know for sure. If I'd guess I'd say around 4,200 but that's just my guess.
Maybe I should aim for 78-79cc when I mill the heads and leave the cam as it is (probably 4 deg advanced) and stay with 200 psi?
With a tighter lash things will change a little in both ends.

I'm just an amateur with a very bad memory so I don't remember rpm crossing finish line... :s but I'm in 3:rd gear and rps are at least at 5,500 or even higher if I recall correctly...