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The cross over isn't there for the choke, it's there to warm the gas up so it will vaporize and ignite int he combustion chamber. Liquid gas doesn't burn, the vapors do and cold gas doesn;t vaporize as well as warm gas.

Without a cross over you are delaying the warming of the intake and that is why it takes a while before you can drive off. You intake still heats up, just takes longer and may not get as hot.

Bet your air cleaner doesn't have a heat stove weither, which would help you. As for the heads and intake without a cross over built in, either they are for FI aplications, racing applications, or fair weather applications. Or you have to wait for it to warmup, just like you are now.

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If the cross-over isn't for the choke, why did Chrysler use the heat retracting spring on the choke pull off? It's part of the engine warm-up process. If the cross-over is plugged everything is compromised.