A spacer between carb & manifold to insulate the carb from heat is always a good idea & essential if the intake manifold is heated by exhaust gas.
I've seen 4 hole spacers solve a few problems on both divided plenum & open plenum intakes (erratic idle, fuel distribution). Open spacers are a tuning device for open plenum intakes.
Can't comment beyond that.
thanks for the congrats.
your friend on the DTBB
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