If you’re not attached to that particular engine I’d hunt down a 261 as a replacement, rebuilding that if necessary.
Wish someone had told me the same about 20 years ago before I rebuild a 235. I had no idea then that a 261 was available, and better, and wouldn’t have cost any more than rebuilding the 235.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-