I had a GM HEI on my motor but it looked way too large and not pretty. I went to the stock distributor and the Pertronics II system. After 5,000+ miles, it hasn't missed a beat and it starts with the first crank. Langdon's mini-hei
would be an update over the Pertronics system. Depends on your budget.
RapRap
1940 ChoppedChevyCoupe