Try an Edelbrock 1406 electric choke carb if you can borrow a good working one. They don't bog, they open the secondaries manually with the linkage and you are not waiting on the engine vacuum to open the secondaries like the AVS carbs.
Had the 1406 on a 383, also had the 1406 on various mopar small blocks, performance and stock engines. Good all around carb, no bog on any of the engines.