The LA motors and all early(pre 1965) non B/RB and 426 hemi V8 Mopars used the same upper cam keys, including the Chrysler Fire power and Desoto Fire Dome hemi motors work
Mr. Gasket sold them in the past, maybe Hot Heads has them still scope

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)