Problem with my 360 with the 273 adj rockers
there are shims available .015.....
http://chucker54.stores.yahoo.net/mopar0015thick.html
before you shim the rockers for side to side movement...line up the rocker over the valve stem....then measure with feeler gauge the amount of shim need to keep the rocker there ...measure both sides...you want some amount of side to side movement...do not take all the play out of it....