Not Ranked
Keep the small block, and have it rebuilt to your liking.
While a SPF can take a 385 series BBF, It wouldn't be my personal choice, the weight for mine would detract from what I like in the drive, plus it sounds like you already have a good head start with your current SBF. Further, a SBF can be made to produce more than enough power for a cobra, so the 385 BBF, in my mind, would be like a bazooka to swat a fly.
The more cubes you build, the better the chance it will be able to give you high power while still allowing some street-ability. So 445 or sure why not 460 if you're that way inclined.
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