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Ok, here’s my story as to not hi-jack the other thread….

Very similar to his story.

67 coronet, 3580 race weight (all-in).
Backhalved, pro-street 4 link (urethane-bushed rod ends), single adjustable Vari-shocks.
Dana, spool, 4.56, 32.2” tall Phoenix slick (radial) – 32-13.6-15
Launching off a brake with two-step at 4800
Shift light set at 6400 (probably shifting at 6500 or so)

Last time out went
60 ft ---- ET ---- MPH
1.440 - 10.139 - 133.37
1.458 - 10.139 - 133.54
1.477 - 10.141 - 133.54

8” converter, flashes 5800
7000 rpm through the traps (hit the rev limiter with a 7000 pill right at the traps all three runs)
Slip calcs out a little over 10%

On the engine dyno, motor made peak TQ at 5000, peak HP at 6500

1/8th mile times on the above runs were:
6.462 @ 106.47
6.470 @ 106.70
6.484 @ 106.87

So, based on where the peak HP and TQ numbers are, what kind of flash range should I be looking for to get the best 60’ times?

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For your MPH it should be running 10.0, I think
your stall is too high and your spending too much
time below the stall at the shift points, I believe
that is also giving you the 10% slippage(which if
you could go higher in the revs it wouldnt be that
much slippage)... your going through the traps right
at the right RPM(10% above peak HP RPM). I try to
shift AT LEAST 1500 rpm above the stall point your
shifting 700 rpm above stall.... what is you drop
in rpm's between gears

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thats kinda exactly what i thought... i have a hard time believing a car that is shifted 700 rpm above the convertors flash is ever going to run as good as it can. That 1500 rpm spread seems like a very good general rule to me, and i know its way closer to optimal than 700 is.

My thought is that torque is what gets a car moving(especially, like in the OP's case its an almost 3600 pound car). my guess is that the closer the convertor flashes to the cars torque peak,(optimally just a hair over) the better the car is going to launch and the better its going to accelerate at gear changes, assuming he can get the power hooked up.

I suspect this is why in this cars case the 60 foot is soft and the 1/8 mile times are as well.