I'm with the rest of the guys here....stick with your set-up.
Have the distrubutor recurved to your set up.
With that I would say an adjustable vacumm(this will help with lite throttle pining) with a curve of 0 degress before 1000rpm and 24 mechanical advance all in @3000 to 3500rpm. It really depends when it should be all in, with a 3:55 gear if you drive the car on the highway at 60/65mph your going to be at 3000rpm all the time. If that being the case have it all in @3500rpm, if most your crusin is done below 3000rpm have it all in by 3000rpm.
One other thing, cool the car down with a 180 thermostat. It really helps if you put an aluminum radiator in...Rodney Red makes a really nice for the 68/69. Your car should run pefect with this set-up.
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