whistling question

It is interesting that I looked through some of the archives on timing here and nobody recommended using the manifold vacuum for vac advance, where with the chevy's, all the ones I've own ran much better and cooler hooked to manifold vacuum, as well as all my friends that had them (street-car wise) Whats different about MOPAR motors where this is not true? Just trying to learn. Thanks[/QUOTE]

I always did too. Most were close to stock and anything more then that i just went mech. adv. only. But i always felt normal drivability was much better that way. Been quite a while, but iirc some of the manufacturers put a vac. delay valve in line to soften any spike down in timing when you first hit the throttle.