Is heak off block? if so, you should take it to a machine shop and allow an experienced machinest make adjustments because he has precision tools and equiptment.
there are 2. 1 is in the engine comparment the other should be behind a pannel
lower left side of the dash looks like a change compartment carfuly remove
drivers side behind distributor I just changed it... It really below the distributor. 1.) Locate the distributor box.. its the box with wires attached to engine with cables that terminate into a box....