I have a 86 dodge truck with a 318 stock except for a 500 holley 2 barrel carb and a converted gm hei distributor and dual exhaust with new cats and flowmasters. Can anybody tell me how to tune this setup? I am getting some part throttle pinging and need to know how eliminate it as I am trying to tune this thing for some decent power and milage. I did see a post on using magnum heads on these earlier 318's. Would that give me better milage along with better performance. I run coast to coast with this truck a couple times a year. Thanks in advance for any help. RD