Ebay GT45 + 5.9 Magnum + E85 blow thru

This was my 7.183/106.5MPH 3rd pass. You can hear me get off the pedal twice when coming off the line. I'm sure my 60' was probably 2 seconds or worse. Engine pops a couple of times also (that is concerning) and then there is a huge backfire after I cross the line and let off the gas completely. Also on this run I was close to 12psi according to my logs. I think at 107MPH in the 1/8 I must be pushing close to 600HP. What do you guys think? Not bad for a JY 5.9 Magnum.