TIMING Q'S RUNNING W/ SPOUT OUT

I know people on here have ran there cars with the spout unpluged i am going to the track @ 3 today i was hopping
someone could let me know how high the timing will really be if lets just say i start out at 30 advanced no spout would that be like runnung the car @ 10 degrees with the spout in? this will be the last time i run my car with the stock cobra set up & nos my new motor & procharger go in this week so i just wanted to play arround with the timing today on joice any help

Any way im leaving to go to test & tune in 1 hour i guess i will try leaving the spout out & try the timing @ 18 .I know with the spout in i need the timing @ 8 degrees advance for my 150 jets even with 110 octain fuel it wants to detonate with anything over 8 degrees advance w/ the spout in so does 18-22 sound about right with out the spout?