Not hard to adapt digital ignition to the EFI setup you have- you're 80% of the way there with the Haltech. My setup is full sequential (Holley) EFI with no distributor. Suggest a 58 tooth reluctor mounted to the inside of the balancer, this wheel is a (modified) Holley, you have to open up the ID to fit the Pontiac balancer:
Here are some shots of the fuel rails, throttle body, and regulator:
If you run EFI in batch mode, you don't need a cam signal, if you want to go full sequential, you can pick up a 1X signal from the distributor. Many ways to do this, I started with the BOP oil pump drive and adapted a machined housing to pick up the cam signal:
The ignition is setup as wasted spark. You use 4 coils for a V8, each time it fires two cylinders receive spark, one makes power the other is unused. Coils mocked up for test fire, I hid them under the dash so you cant see anything in the car:
