I used to run 318's with 360 heads,484 purple shaft, LD340, intake and a 750 holley with a 400 hp shot of nitrous. The rest was left stock. I used to get the motors cheap from junk yards and run them for one or two racing seasons in a Duster. I broke 2 cams due to bad bearings. I started replacing bearings after that. I had a crank get wobbly and lose oil out the front. I never broke a crank. If I had used one with badly worn bearings maybe the crank would have broke. I also ran a 727. The 833 is harder on cranks. Most 318 cranks won't take a pilot bushing. The way most people drive these cars today a stock 318 crank would never get hurt.