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The phenolic spacer is always a good idea to help rid your carb of percolation in hot weather. I have a 3/8" phenolic spacer on my manifold and it does help. See to it that the carb and intake manifold are clear of the edges of the spacer.

Finally, I found during my carb true up details that when you are turning your idle mixture screws for the best idle and rpm, take care to follow up with how that all transitions from the idle circuit to the transfer circuit and on to the main jet circuit. I adjusted my idle mixture screws using an electronic exhaust sniffer for maximum idle mixture. However, what happened on the street was a slight cough when leaving from a stop as the carb trransitioned from idle circuit to transfer circuit. All I did to fix this was to turn each of the 4 idle mixture screws out about 1/8 to 1/4 turn. Good results as well as much better off idle throttle response when cracking the throttle open..... at the expense of a richer idle mixture.