Rockers are alloy
Pedestalas are alloy
Shaft is steel (main pedestal shaft that is)
Rockers are longer and pedestals are in orig position.
No mods to head required
Tips are roller
Pushrods need to be changed to std type pushrods instead of A series bucket and ball type.
I have pics on my dodgy site of pushrods I used and roller rockers........inc price I paid when I bought them all those years ago.
YT6023 1.55 ratio
YT6024 1.65 ratio
TY6304 1.55 ratio with semi finished pushrods (so you can cut them off to make your own required length)