Was it original motor/? I never saw an SS with the 250 HP, but that said, this was a day when many people ordered them as they wanted, so a lot of combinations are out there. Saw lots of 300 HP 327 back then also. That was the motor I liked to start with. If you still have it, on the front of the head, does it have the double hump casting mark, ot the rectangular mark with a triangle shaped point in the middle? The 300 HP and 350 HP (as well as the 375 fulie motor) had the double hump.
Never know what is out there. Dealers specializing in High Performance like Motion, who ordered factory cars like Phase 3 427 Camaros and so forth. Yenko was another...well, something close to Yenko. Those cars are now worth a fortune. I remember latching onto a rare 302 Z28....1967. Everyone told me it didn't exist, and the badging was just put on. Nope, there actually are a few.....if you knew the right dealer and checked the right options.
Another thing, is the car companies played insurance companies on HP ratings. If you disassembled that 250 HP motor, it very well may have the same bill of materials as the 300 HP. There were also solid lifter vs hydraulic lifter versions also. How many scrap yards we poured through.
69 Roadrunners, Chargers and so forth could be had used for next to nothing. I remember a common phrase back then, "Any Corvette that runs is worth $1000" now maybe the wheels!
In the 70's, my friend bought a 1957 Corvette convertible, 283 small block with dual 4 barrel Cater WCFB carbs, removable hardtop, Wonder bar radio and all, perfect condition for 1800 bucks. Some guy ran a stop and dented up a front corner, he thought he made out like a bandit as the insurance company gave him 2200! PPPFFFFTTTTtttt. You could offer that car for 75 grand and have fist fights in your yard over it.
Bubba