One thing to watch out for on the 235 is the valves hanging up and bending the pushrods or breaking a rocker arm. Take off the rocker arms and tap the valves with a hammer to make sure they are nice and free. Make sure your valve train is getting plenty of oil. I would run a premium high detergent oil in the engine to catch all the crud and change the oil every 500 miles for a few changes to get all the sludge out of the motor. I like Delo 400 15w-40 in my 261. (235 is the mostly the same).
