The factory didn't use an electric choke like the Thunder uses. So part of the problem is that it has no idea what the engine temp is.

I ran an Edelbrock Performer on my 64 300, but I used a manual choke. Pull it out, drive till it warmed up and pushed it in. Ran fine in all weather, even below freezing. On my 413 you'd know when it needed pushed in because it would bog with the choke on and it warmed up. Open element air filter (no warm air), stock intake (with exhaust crossover).

Tuning to an AF ratio is not best. Tuning to what the engine wants is best, you can note the AF ratio if you want, but if it needs more fuel, then it needs more fuel. Especially when running an unheated intake that doesn't help fuel atomization.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.