In my opinion, it's not really to much of a risk on a 235. Lifter and cam interface has become a huge can of worms and really doesn't need to be. Valve spring pressure and lobe design are what kills cams. A radical lobe, Extreme Energy, for example, slams the valves open then drops them to get maximum degrees of open time in a limited amount of time. These quick ramps create extreme amounts of load on the cam and lifters. On the other hand, a stock 235 cam has very little lift so the lifter just rides up gentle ramps with very little load on the cam. Then you have to consider valve spring pressures. Most racing springs have 300 to 500 lbs of pressure when valves are fully open, now your typical 235 when new had 140 lbs of pressure when fully open. Combine the easy ramps and low spring pressure, there is very little load on the cam. On top of all that, rpm also has role to play.
Just replace the lifters and run the engine just as you would if it had a new camshaft. Use some break-in oil or add some zinc additive, once broke in, drive as you normally would and change oil when you see fit. Use the oil of your choice, and just for good measure, add 1/2 a bottle of additive, then next change add the other half. Third oil change you can go without if you choose. I quit adding it to my 250 8 years ago and now run off the shelf 5W20 oil.
Joe
