Now you want to adjust, turn up the fuel. Well, unless you have an EGT (Exhaust Gas Tempurature Guage) your messing with something that will mess up your engine. But if you insist on doing it here's how.
On the IP gear tower, below where the oil spout is, is a cover held on by two (2) bolts, remove that cover, then you will see the IP drive gear, There is a dowel pin that drives the IP along with three (3) bolts that hold the IP to the gear, DO NOT loosen them. Now rotate the engine by hand, 15/16" socket on the bolt that holds the damper pulley on, rotate engine so the dowel is at 12 O'clock, with the cover off the IP the hole to adjust the fuel should be there, if not, rotate the engine one more turn, so the dowel is at 12 O'clock. Now you can stick a 5/32" hex key in and adjust the fuel, ONE OR TWO FLATS OF THE HEX IS PLENTY, USUALLY THREE FLATS IS MAXIMUM put both covers back on, use a little RTV on the front cover. Start engine, reving to WOT (Wide Open Throttle) should make the exhaust puff a cloud of smoke black, driving down the road with WOT should make a cloud of black smoke for about 100 feet. The pic below shows the IP driven end with dowel slot and the three bolts that hold the IP to the gear.
CAUTION You may have to rock the engine a little to insert the hex key. DO NOT LEAVE THE HEX KEY IN YOU CAN SHEAR IT OFF