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in jegs and summit they sell a re cal tuning kit its easy and their tech or edel tech can help if you get stuck just do your tuning in the weather you drive the car in most
The distributor can be on vacuum at idle or off vacuum you will need a dial back timing light to insure what you really have, a sort of stock sbc can handle as much timing as not to Rattle ( ping ) if you hear it ping retard it 2* at a time till it goes away, if you have to much timing it will at some point burn a piston, any performance work in the motor wont take as much timing before it starts to ping, having the distributor re curved for full centrifugal advance is another way to get it all so to speak, almost all carb sbc motors seam to run best between 36 / 38 deg of max timing around 3200 RPMs again its a guess not knowing any real info jz
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