Making progress. It will occasionally stall when going into D or R, when fully warmed up. Has not happened when cold, yet.

FE engine has a mild cam, specs unknown. HEI distributor, seems like stock stall speed tc. C6 transmission was supposedly rebuilt, hopefully new tc was well.

I have not taken any vacuum readings yet. My first thoughts are vacuum leak once fully up to temp, maybe messed-up torque conv, but once going, it behaves fine.

Clear gas filter before carb is full, sight glasses on carb shows good levels. New Holley red electric fuel pump. Fresh gas.

Thoughts??