rocker arm and push rod question

ok ..now that i have that off my chest ,how do i fix this nightmare? does anyone make a set of rockers that use spacers so that i can center the rocker over the valve? question 2 .... it looks like i can use longer ratio rocker arms to help correct the push rod problem, but not on all of them. how much material can be removed from the pushrod cast hole in the heads, i would like to get at least .060 clearance around the push rods..... anyone have any thoughts or similar problems ? question 3 ..if this is a casting shift problem how do i tell? i can get different heads if it will solve the problem, but i dont want to go through all of that to end up with the same problem. these are 360 'J ' heads if it matters. and the motor is a numbers matching 68 340. the build date shows aug 67, ... I really need some help on this one guys ,any help is most welcome..... thanks