Intake Fitment

Find an assistant to help you. On the next cold start when the engine starts acting up try moving the choke blade opening more or less to see if the pull off setting is what the engine wants. Also check the pull off to make sure it’s not leaking. And or if the choke is opening too fast or slow.
All your factory settings may need to be changed due to the non factory cam. Such as idle speed, choke and timing.
Even if the manifold doesn't line up perfectly it could still be sealed up but you should verify to make sure it isn't leaking.
Chokes can be a real pain to get perfect. Especially all electric chokes. Sometimes you have to compromise. Good luck.