FInd a old dual point accel dist they have a virtual perfect timing curve for 340 esp if you are unfamiliar with recurving one also cheap. Set the total to 40 - 42 degrees to start. Forget initial as long as car starts Carb use 28-31 squirters depending on temp jet frt 71 the rears 76-78 again temp altitude to be considered USE A 4 HOLE SPACER not a open one get a good dual plane do not use a performer unless its a RPM. Get a set of 3.91s or even 4.30s that car will plain haul tail and if it doesn't you need to look for something wrong internal