Been looking everywhere to come up with a good Spark advance table or any other things to help. Running a TBI 350 with Headers, dual flowmasters with Comp Cam 12-366-4 Lift: .520"/.515" Duration: 268°/280° Lobe Separation Angle: 113° Has ecm 1227747 $42

If anyone can please help me with any of this id appreciate it. Im kinda new to this but have messed with it quite a bit so theres some smaller stuff i may not know. My map reading at idle runs about 60 kPa at about 550 RPM. Ive tried started working on its idle first to keep a good steady idle and lope but when it does start to lope right it looses its rythm.