340/360 J head rocker adjust stud

If you have adjustable rockers and they are mopar they come off a 273. Here is the link to summit, check the thread size and pitch but I believe these will fix you're problem. The adjustable rockers and shafts will bolt on any LA head, and apparently that's what someone has done. I have a set on some worked 318 heads.

http://www.summitracing.com/search/...9+4294951330+4294947988+4294949512+4294890866