Vortec 5.7 Distributor Failure

I have a problem with a suburban99 Vortec 5.7 What happens is that in the distributor's lid does not come out spark in the posts 2y8 I already changed the cover, rotor, spark plugs, chain and chain gears

I do not know if the problem has already been solved but if not, check the wear of the distributor of the distributor that these on occasions are wearing and baria the arrow a lot, although most likely it is that the lid even if it is a new steb failing I recommend that you try an original lid or one that you are sure that it does not fail. out