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What camshaft specs?
The engine is getting for 3500 rpm from somewhere, have you got an unused vacuum source not capped?
What have you set the throttle blades open at?
Double pumper 4 corner idle carbs should have the transfer slots just exposed as a "square" to start with.
Have you run the camshaft in?
How much total run time has it had?
Have you had any success with your car problem?
I hope my advice has been of assistance to you.