slowmofive089

so i have had my mustang down for three months, got the whole motor redone , new clutch,injectors,cam exct.the car sounds good and idles fine, fires up with no problem but under not so hard run threw the rev range the car sounds like its missing , what should i have the timing set at? ( its at 11 right now), fyi the gas thats in thew car right now less then 1/4 tank has been in their for at least 3 months. hope i am being clear .--thanks guys