Carb Devac a 1985 Honda CRX HF with CAL Emissions & A/C w/o Issues?
 

Any tips on a Kiehn Carb DeVac for 1985 Honda CRX HF (1.5 liter) with California emissions & air conditioning? I I want to keep the A/C & the 3 barrel carb has been rebuilt. with new insulator plate.Any way to reduce MPG loss or to improve it with devac?

Note: My 1985 CRX HF, even with CA emissions does not have the oxygen sensor & nor does the 1984 CRX, however the 1986 & 1987 CRX's do.

Would I need to retain any of the black boxes for running the A/C w/o any issues? If yes, which black box? I don't reside in CA, so the CRX HF is exempt.