71 valiant engine build, which carb to use

I have used two of the Holley made Street Demon carbs, which are a 'loose' copy of the TQ. Demon was probably a good name for them. The quality is quite poor & from what I remember met rod changes were fiddly. One carb performed quite well, the other had a bog when the secondaries opened that no amount of tuning or jet change could fix. No bog with the original QJ carb. If these carbs had the air valve dashpot like the original the TQs had, it would have given more tuning choices. Maybe omitted for cost?

If the engine is to be street driven, the cam is a poor choice for a 318. The duration numbers at 050 are pretty big, but the huge advertised duration numbers will guarantee a pretty rough idle.

Put an 800 TQ on it.