Timing Retarded

Are you saying that you unable to physically set the timing further ahead? The slants have a limited amount of distributor movement, with TWO adjustment slots. One is the "one you see" and the other is the slot at the other end of that bracket, with a bolt up under the distributor.

If you cannot get more movement, if the timing chain is OK, and you want more initial timing, you'll have to move the dist. one tooth.

You can see the "other slot" in this photo