Hello, You asked if a 239 Yblock was worth the time and money to rebuild IF it was going into a 1929 car. NO. If you want a Yblock a 292 will cost the same or less to rebuild and give much better preformance. As has been said the 239 was a one year only and the cam bearing journals are different than the 272/292/312 cam journals and the oil pump drive and distributor drive is also different. The intake ports on the heads are small and may not seal with a bigger intake manifold. Even if the 239 is free it just is not worth it. There are a lot of good 292 out there. Pete