A little caution for you ! Way back in the early 80s , I installed a comp cams hydraulic cam and lifters with the Isky pushrods and adjustable rocker arms in a 340 . I found that the Isky pushrods were chipping all around the end at the lifters . I found that the contour of the pushrods was a much flatter angle than the cup in the lifters . Apparently the Isky lifters were the only ones comparable at the time . I changed to a different brand of pushrods , and all was well !