comp cams sold me a cust. cam grind for my 54 235 for heavy towing went in perfact same casting and all but went to put the lifters in and darned if they sold me the wrong lifters (to small od) they were for a reg. small blk chevy my six needs real large hyd. lifters. Napa says no go, anybody sell new hyd lifters for that 54 235 or know a part # for a set