ok so i just got my brand new clevite double roller, and its got timing advance on it, stock, 2 degree and 4 degree... I'm running a ford 302 in my 66 mustang, 2bbl carb(temporary), a lil torquier cam, roller rockers and 69 HI PO heads... i was just wondering if its best to leave the advance at stock or if theres any benefits/problems of advancing it.... i dont want to advance it and then run into a buncha problems and have to tear the front of my engine all apart... any help would be great... thanks