HELP figuring cam lift ( maybe actual purple shaft p/n?

I'm building a .060 383 for my 71 Demon. Mostly a street car that I'll likely take to the track a few times.

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If you had to have a MP cam for that, and it had to be a SFT, and if they were still budget friendly(and actually available), that really sounds more like a place where a .528 cam would be a decent choice(as opposed to the .557).
I’d use the specs of one of those and look for something similar that’s readily available.