Well make sure you got power to the hot side of the coil. If you have points then make sure that they're gapped correctly and hooked up right with the condensor, and hooked to the correct side of the coil (negative). If you're running a Chrysler electronic setup MAKE SURE the box is grounded to something wherever you mounted it.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street