Your first step needs to be determining WHAT YEAR ENGINE you have, then get the repop factory manual. Ed Faxton might be a good source, as he is in Riverside. Let me WARN YOU - the 235 is NOT A CHEAP BUILD, PARTS ARE MUCH MORE EXPENSIVE than the later sixes (250-292).
I live in El Cajon, east of San Diego, and have built a few 235's over the past 30-odd years. I can help with a lot of info on parts and building. PM me at 6-bangertim@cox.com, we cn swap phone numbers there and we can talk easier than typing!
- Tim