well my buddy has a 67 chevy truck with a 355 that he just g0t d0ne rest0ring recently. he had a sh0p build a m0t0r and put it in. well we checked the timing the 0ther day and with vacuum 0ff and its at 22* at idle. vacuum advance 0n its at 44* at idle. if y0u rev the m0t0r up, it ends up g0ing 0ff the scale and the timing light st0ps w0rking. the timing light is the kind that y0u can dial in the advance and it g0es all the way t0 60*. we didnt have time t0 adjust the timing but im thinking ab0ut setting it at ab0ut 10 degrees vacuum 0ff. spec f0r a st0ck 350 is 6-8 but this car has a cam in it and 327 heads. i was just w0ndering what y0u guys th0ught 0f the timing deal. s0rry its n0t a mustang but i figured y0u guys c0uld figure it 0ut. thanks