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I can't be too much help, but I'll offer my experience. When I swapped motors I switched from the stock manifold to an Edelbrock Performer intake manifold.
My cruise control still resumes to work.
I however do not have California emissions. I also have a Q-jet and the stock distributor.
The only place cruise "shares" anything with the ECM is the VSS signal it takes from the speedometer. But even if you remove/unplug the ECM, the VSS signal will still get to the cruise control module.
Glad to help. I used to rip all that stuff off when I first got started in this vintage vehicle, as I learned how it works and how it's run, much of it (like the cruise control) I've come to value and enjoy.