Another thing to look at is the distributor advance curve. I did a lot of work on the HEI in my dad's camaro (383sbc, 230/236 110 cam, 4speed, 3.42's) and it completely changed the drivability of the car. It was almost undrivable at low rpms before.
I limited the mechanical to allow for more initial (14*). Bigger cams can handle more initial. I chose springs and set their preload so that the mechanical didn't start to come in till around 1100 rpm (it started coming in at a very low rpm before, making timing erratic). I moved the vacuum advance from the timed port to full manifold. The timed port would make the car lurch going on and off the throttle driving around town. And I limited the vac advance to 10*.
These changes completely changed the way the car drove. It idles better and more stable. It doesn't try to stall any more when talking off from a stop. And it drives smooth at lower rpms around town.
Last edited by adynes; 01-28-2018 at 10:39 AM.
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