It isn't falling on it's face off the hit, it's usually 40 - 60 ft out. We log the AFRs (left and right), you can see the lean spikes, sometime right where the converter stalls, sometimes .3 -.4 seconds later.
Also we have seen a double lean spike, like the fuel moved away from the jets, then returned when it stumbled and then did it again.
Were running a Magnafuel 500 fuel pump and now have -8's to the carb, -12 main feed to reg, and 2 -10's from the the tank to the pump.
Changing the lines from -6 to -8 on the carbs helped we came down 2 sizes on the main jets as it was too rich after that.
AFR's also go richer towards the end of each gear change, typical 3rd gear might start at 13.1 and end at 11.9.
I didn't know the 4150 pump cams would work with a 4500 carb, or do they have to be modified.
Thanks for the answers so far