Timing question

To get to the bolt holding down the distributor it helps to buy the special U-shaped wrench just for that purpose otherwise it's tough to get a wrench or socket on it.

Another point, you may also want to check the vacumn (yes the spelling is correct) advance to see if it's actually working. The backyard mechanics way is to just pull the advance hose off & on while at a fast idle. The engine should respond appropriately.