Stock 318 Roller Conversion

yeah you need to buy some roller rockers for the shaft. That being said, the original rockers were really not that bad of a design. they were extremely strong and not really that heavy. the only downside would be the ratio and the non--adjustable factor.
I just built a 318 for my pickup. I used the original rockers and shafts from 1975. they looked like new almost! (after they were washed at the machine shop) JMO...