235 are everywhere. If your patient, you could probably get one free just for picking it up. You would want a 60 - 62 with an 848 head. 261s are getting hard to find and will most likely cost between 500 and 1k. They were available in the 2 ton trucks and Canadian pontiacs for the most part. In 62 only, they were available as an option in smaller trucks. And in 63 they were available in 4X4s.
