looking forward to seeing at the track again, 850 might be too big, but worth a try. Do yo have 750 double pumper? And that Wallace computer has given some optimistic et’s see what happens.
I've got the gold claw with the changeable sleeves off my Cortina. I think it's got 770
cfm sleeves in it, but I don't have the throttle linkage for a Mopar kick down for it.
It may not work as a footbrake carb, I ran it with a transbrake.