Remember that the 383 is at least 52 years old, I can't see it not having to be bored unless it was rebuilt in the past and has been taken care of and has low mileage. Cam, 4 barrel, cylinder head work or aftermarket heads, the 383 will not get any benefits of these modifications if it has low compression due to excessive cylinder bore taper. If it has a ridge at the top of the bore chances are good that it will need to be bored. Not trying to be negative, just hate to see you put it together and then be disappointed in its performance.