The 235 block was built on the old school principle that "bigger is better", and the cylinder walls will stand overbores of .080" for routine rebuilding, and bit more for hotrodding. The 194/230/250/292 blocks are the thinwall casting type, and .040 over is probably the most they should be overbored. As long as you've got a clean radiator in good condition with enough air moving over it, you won't have a problem with that 235.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!