Ok helping a buddy out on his 305 in an 86 c10. Its got a 305 with some junk small tube headers, edelbrock 500cfm electric choke carb and stock hei ignition.
Got the truck to idle real nice, replaced cap/rotor and plugs. Set the timing to the prescribed 4* with vac advance plugged. When I rev the truck to 3000rpm with adv plugged in it goes to around 25-26*.
Truck was dieseling prior to the adjustements now it starts, idles and shuts off clean.
But when driving it and you give it part throttle to full throttle is pops and bucks through the intake/carb
sprayed all the wires down with water and hei stuff, nothing is arching and then sprayed around the base of carb area with carb clean and did not find any vac leaks.
ruled the fuel filter out as well.