It's a great idea and many of us have already done it and reported about it here! I suggest you spend some quality time in the archives of this forum. I remember at least one guy adapted a GM ECU to run a Pontiac, and I think it was an early LS one.
I've had multi-point sequential EFI on my '66 GTO since 1998 and would never go back to a carb.
For a Pontiac retrofit, I really don't see the value in sequential EFI... batch-fire would be just fine and if I was doing this again, that's what I would do. There's no way any of us has the patience, dyno time nor $$ to accurately set up sequential injector timing throughout the engine's range. But if you have your heart set on an LS ECU, then of course you'll have to come up with a way to measure the camshaft TDC for the sequential part. I did it by modifying a small-cap HEI from a TBI SBC truck engine.
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