Good question - I bought a 235 in AZ and decided to have a shop out there go thru it. The shop has an ol' guy on staff that used to race for Chrysler Corp. & has experience with Chev, GMC & Slant 6 engines. They are going to warm up my 235 a bit. I'll bring it back to IL when they are done with it. My mechanic here in Plainfield is Tim's Garage. He has a few miles on him and could do a stock 235 engine (local NAPA guy said Tim would be good). Right next door to Tim is his buddy Harold, the machinist.
Unless you have other leads, you might want to give Tim a call at 815-436-7682 (after 10:00 am)

Good Luck,
Sherman