I am interested in getting a s1x cam.As for a timing chain set i am unsure what to get.I understand with the double roller you need to remove the balance shaft gear at least and get a milled cover.Is this the best way out?The car is a DD.Or should i get a single roller?Stock replacement?I have 105 springs already.Should i upgrade the valve seals?The stock one are currently in now.Are dampeners needed for the rollers?