And to get the clams out, I would have to import my wallet.dat into the clamcoin wallet
Wait.You sure you're on the right path ? Blockchain.info is a bitcoin wallet.How did you manage to store calmcoins in it ? I'm confused,tell me I'm correct or Am I missing on something ? Op,you must have bitcoins in your wallet...and not..calmcoins.Mind sharing your calmcoin address from blockchain.info ?
Actually op is trying to claim free clams, the rules are must own bitcoin address and had coins in them prior to may 16 2014 not only bitcoin but also litecoin and dogecoin address ( i'm looking for my old doge and ltc address to ) this is their initial distribution type, the price is currently $6 each, i regret deeply selling my clams that i've got for free at the cheap price.
I claimed my free clams before blockchain updated their wallet to the HD wallet.
There are no such option anymore.

You can only IMPORT bitcoin private keys to it. So if you want to control your bitcoin wallet funds then generate new bitcoin address with private key everywhere and import it to blockchain.info. So if they go down in one day you will able to continue managing your coins

This is why i confused, so it means that we can't export our bitcoin address anymore? Sadly i have some old bitcoin address and need to be exported, op you'll be lucky if you can export the address the clams price is high right now, all i can say good luck for you. So how much clams that you will receive?