HEI Problem (help, I'm truckless!)

[jtminton]

Thought I'd take advantage of a long weekend and swap out my dizzy for an HEI. Got the HEI from a swapmeet. Put on a new cap and rotor, then put it in. I ran a wire from the Unfused Ign slot on the fusebox, and used the ground strap thingy that was in the old cap instead of running a new ground wire from the coil to the plug. Anyway, got it all hooked up and no spark. I get 12v at to the coil, but no spark at the plug. I went and picked up a new coil, thinking that was the problem. Put it in, hooked it all back up and have the same thing. 12v to at the coil, a good ground, but no spark. What's next?

I have until Monday to get this working, or I have to put the old dizzy back in to get to work. HELP!!

Thanks.