To upgrade intake manifold on not?

Amazing as I’ve been using cold air intakes since 1980 and haven’t had an issue. That’s all I use. If you can’t get the fuel atomized without that power robbing heat, use a different booster.
It’s really of a choke issue. A quick reacting choke will close quickly and grab the high idle.

I know... I know... no stinkin chokes for you....