Buzz,
Set your idle timing by loosening the dist base nut and rotating the dist clockwise[ advance] as you look at the timing marks with the timing light.Set it to 16*,tighten base nut. Now take of the dist top ,engine not running, and rotor. Find the mechanical weight springs and see what they are,light,medium or heavy,probably colored black,silver and so on. You would get an assortment in a msd spring kit and now put in one step heavier. Most stock dist are set for 28* mechanical advance, next step down would be 24*, then 20*.Try and get the 20* set of springs and install them. Put everything back to gether and run engine at 3000 rpm and see if timing is 36 to 38* total advance[ 16* initial and the 20* mechanical] You may have to change spring a couple times to get it correct.
Perry.
