Glad it was something as simple as no fuel in the carb.....
Just to clarify my post was for the large body HEI, not the smaller early style. I've had a lot of experience with all different types of failures with the later unit, being in the automotive repair field during the 70s and for years after. I've seen about every part fail in them, at one time or another.
I had a 73 G/A with the early small body, and even in the 70s it was difficult to buy parts for. I had a module fail in mine, and because of the expense, and difficulty of obtaining a module, and a plug wire set, I converted my car back to a point distributor. My 73 T/A also had the early unit, and it never failed, but to be fair the car had very low miles on it, under 20,000.
I hope yours never fails as the parts are only available as NOS leftover stock. GM never supported that unit even when they were fairly new, and parts were quite high priced.