1980 corolla 3tc ingnition problem

This just happened today... I run a few tests on the ingnition system. Found out the coil was kind of weak. So I had the great Idea of putting one of those MSD coils for GM's from autozone. I installed it. The car did run, but i could only drive it for like 250 feet and the engine died. It wount start , there's no spark. Can somebody tell me what happened???