Rabbit: You gotta know this is my fist BBC, w/roller everything. Prior to this, all I had was SBC's that were more mild & hydralic.Having said this, I am new to all of this & learning as I go...which so far is good, but EXPENSIVE! Anyways, being green on valve trains, I am not sure I know exactly what shaft rockers are. I assume they are direct fit & lash is done by shims... I will look em up on the net or my catalogues. Gimmie some suggestions if you want. Thanks Bro!!