I deciphered the Comp kit parts list once & they list the rockers to be Narrow Body & if I remember correctly they fit small chevys with centerbolt valvecovers.

I have the correct applications for each part wrote down somewhere
to do it on a Magnum you use a pushrod for a 64 or 65 289 Ford

one part I think was Magnum only & is listed with the kit only not with the parts like it