The 269 Condurre was a pretty nice boat in it's day. A friend of mine bought one new. Nice lines, built well, worked great.
As mentioned above, a good survey needs to be done to establish the value. As with any older boat, I'd be concerned about rot in the transom/stringers etc. Even though they were well made, you just don't know what's been done along the way.
As for the asking price, In my opinion

even if the hull checks out sound, it's priced about 5k too high for todays market.
As for the Alpha one's behind 350's, they will be just fine. I've had many older boats with that combo, they live quite a while with reasonable care. If you did have a problem, throw another Alpha on and be boating the same day. Not worth the expense of re-rigging to a Bravo (or Volvo) behind the mild small blocks.
Post some pics!
Kurt