i am on my 3rd magnum headed la motor luv it!! will never go back to outdated la heads, my 76 aspen with 43k miles on it i just did the magnum head swap night and day diff woke the lil teen up sounds like a mean teen now lol go for it you waon't be sorry just make sure you have the correct length pushrods 7.625 in length with a hydraulic flat tappet