Before buying a 235 first look for a 261.
Years ago when I was searching for a new engine for my truck nobody told me about the 261 and I had no idea they even existed (pre Stovebolt page for me).

Had I known I sure would have used a 261 instead.

•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-