That confirms that it's a high perf build, those carbs/intake/heads all point toward that.
Doesn't matter what she was, depending on what cam and what exhaust she gets, it will have a ton of torque and HP
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Most guys would factor in the costs associated with tearing her down and putting her back together to proper specs with new internal rotating components, gaskets, etc. I'm gonna hazard a guess and say a running passenger engine with the big heads, two four intake with correct carbs would be in the $4K to $6K range. If one "parted it out" you'd have a $2000 block, a $1500 set of heads, and intake and set of correctly numbered carbs worth almost as much as the heads, and then you get all that "tin" such as the oil pan, the timing chain cover, maybe dripper valve covers?
If you thought of it as a solid core, you'd spend $$$ on the rotating assembly (crank/rods/pistons), then rebuilding the 690 heads (another thousand), next those carbs ($500ish?), then spark, and the list goes on...
On the other hand, remember those days when they sold engines for a dollar a cubic inch? I remember my big brother bought a running Pontiac 389 for, you guessed it, $389! So if that engine runs on the stand, sounds good, and he is asking $409 I'd be all over it
. Didn't Ray get a 409 using that very favorable to the buyer logic?