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Did you go through the base setting procedure? Set throttle blade, adjust tps voltage with iac unplugged, set timing with spout unplugged, etc? Assuming you have 5.0 timing cover too as a different cover could have a different tdc mark. Or you could try advancing the distributor a little while running to see if that make a difference. Guessing is not the best idea but may give an answer.
 

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Discussion Starter #23
Thanks for the pointers. Really I haven’t gone through all the steps. Often by the time I start the car and run around to the engine bay, it might splutter before I get in to fiddle. Also with open headers currently it’s pretty obnoxiously loud in my garage. Once I get some mufflers on it I’ll more likely be able to go out and play in the afternoons after work without waking the neighbourhood (live in suburban Los Angeles, my neighbours are 8” away).
 
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