Hi i have a set of gt40p heads forsale have been ported already good for about 500hp...

since i found out my car was pinging, after the mods i have done, i can't seem to stop it. Attempting to stop it via the dizzy has improved it. But still pings a bit around 4300rpm and there is some hesitation when taking off from a standing start. Thinking about a chip or aftermarket comp as I have finished the mods I wana do.
What should I do?

i think the only person who can answer this question is xr9ute. what he doesnt know about ford ecu's out weighs what most of us could guess about.

i have an eb xr8 with gt40p heads ported , mild cam gt40 intake el gt extractors with 230 kw and no computer mods and ran a best time of
13.80