yep ok most all the bbc i use the 3/8 pushrods the guild plates can be had from many comp /gm/manley but mark 5/6 are not the same they have a 3/8 bottom stud or tower bolt and are thinner to so if your working on one of them you need to look at this .i drill and tap them for old mark4 studs 7/16 top and bottom s and use the old mark 4 guild plates