running rough

[gtaa9]

I just bought a 68 GTO with a 400 auto.I noticed that it was running rough so I check the dwell and it was sitting just below 20 and I know that it suppost to be at 28-32.I ajusted the points to 30 and then I check the timing it was alittle past 12 degrees advanced it suppost to be at 9 degrees so I was ajusting the timimg back to 9 degrees and it wanted to die.So what I ended up doing was puting the timing back were it was and the points back were it was and it runs better but still runs alittle rough.I have'nt replaced points or spark plugs.I appreciate any and all suggestions.Thanks