LA roller vs Magnum valvetrain...

difference in lifter is or was...LA did not oil thru pushrod ...Magnum did...but now the replacement hydraulic roller lifters are magnums even for the LA engine...just use a non oil thru pushrod for LA head.

as for pushrod length ...look at replacement pushrod respectfully for each year of engine and see if they are the same length...but magnum will have oiling holes..LA will not