Bad idea anyhow, the divorced choke will not longer work correctly, and the engine will not perform well until all the parts fully heat soak anyhow.
I would not block the crossovers at the gaskets, but it will help to block the small holes at each end of the "channel" directly under the carburetors. Although the engineers meant well with that particular intake, todays fuels don't do well with the carburetor being heated up that much and we get quite a few complaints from folks using those intake manifolds.
The complaints always come in here during the hottest months of the years, we seldom hear anything about that deal in the cooler months.........FWIW......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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