kpb hit the nail on the head
You have to remove the dizzy to take the points out and clean them, and doing so means that, when you put it back on, you'll have to retime the beast.
You need an inductive timing light hooked on to wire #1, and you need to be able to see the pointer and read the numbers on the harmonic balancer (easier said than done, the rad hose gets in the way). Clean the balancer off, find the 5*ATDC marking (with it not running of course) and mark it with a bit of silver (or other high-contrast) paint.