Do I need one?

Im swapping out to an Offenhauser 4 barrel and Dutra Duals. Ive been doing some reading, I keep reading and heat box and Plenum keep coming up.

Do I really need it/one if I live in Souther California? Not too many Cold Starts over here.

I am picking up a Mini starter to help with the Dutra Duals.

I am debating between Edelbrock 500 4bbl or Holley 500 2bbl.
Any suggestions on which one?

Thank you!