You got it.....But the 89 heads are non adj. so after removing the rockers I am left with a threaded hole, I need to get the screw in studs don't I? The 68 pushrods used with the non adj rockers probably smashed the lifter down 30 thsd or so, With the adj rocker I think it will work out. Oh I also figured out why They put two sets of intake gaskets in my kit, now I just have to pick up a 77 or newer intake manifold as the 68 manifold will not mate up perfect on the water jackets.