You've asked a couple of questions there, Bobby. Let's see what we can say...The 228 distributor (working from memory here as it has been about 40 years since I owned one) is not unlike the 235 distributor. If you look at the way the distributor connects there is a collar with a screw and nut which is tightened around the distributor housing which goes into the block. Then there is another part which couples with that collar and it is held to the block with a bolt. You can adjust timing (advanced or retarded) by loosening that bolt and moving the distributor clockwise or counterclockwise. And the vacuum advance moves the entire distributor clockwise as vacuum increases. There is a picture below...Hope you can see it.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
