Timing is good,oil pressure is great. Had a holley 850 on it before fuel injection went on was a pooch of the line then as well. Will smoke the tires if i tap the brakes, but even then seems like it should being climbing up on the rpms way faster
I have seen many with your same thought . Believe me Put a 3500 converter in and your eye will open wide . That would be the lowest stall. Myself I would put a 4500 9" tight. Then hang the hell on.
Muscle cars came from the factory with 3500 converters 340's stalled at 2800-3000 form the factory same converter behind a 440 3000-3300 I played with factory converters for many years.