it going to be very hard to set the lash on rockers thats a gen 5 or 6 and that is a tower bolt and NO lash adjustment can be made . you would need to change it over for a rocker stud done many . you use the 7/16 /3/8 Arp 135-7102 or on race engine i drill and tap head for a 7/16 top and 7/16 bottm stud then rocker arm stud setup you will need and older mark 4 rockers and guild plates less you buy new balls for your old rockers to fit the 7/16 stud as the tower is about 1/2 and the rocker ball is bigger as well comp sells a kit and others but i just use the older mark 4 hard ware