Personally, I'd leave the BBC alone and run it as is. It has an 8:1 comp ratio, plus as you stated, hardened seats.
I'd re-torqued the heads just to be sure and ROL gaskets are fine. Remove heads, replace gaskets.
As Tim suggested, maybe later add a turbocharger. If you want alittle more power, the most cam you can add without changing springs, would be the next level up, a 268 or 270.
The peanut port heads are good heads for making torque. Trucks use them. The small port keeps intake velocity up for good cylinder filling. Besides, BBC really don't care to be wound up and torque is what pegs your Seat-of-the-Pants meter.
The above is just my 2 cts. But, a weekend's work, I'd drop it in the car and try it. Place the driver's side header in first before dropping the engine.
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