About the only option for a 235 is to offset grind the crank for a longer stroke - but this results in smaller rod journals, so you have to find connecting rods with the right journal size, as well as the proper length and pin height to match with custom pistons. A lot of effort and expense for not much payback. However...Tom Langdon of Stovebolt Engine co has come up with the right combination of OEM GM parts (Cadillac V8 pistons, 292 rods & bearings) to make a 290 cu in inline torquer from 261 block. This is quite cost-effective but does require some precision machine work on the crank.
