wisemen help!

[CMiuc12s]

Ok, I am running into a problem here. I am trying to get this beast back on the road today. I tried to start it and had a loud backfire I have already set the timing. Cams lined up, crank on mark and oil on mark. Just had the head redone with HKS 264in/272ex, Fidanza cam gears. Need help!!!!!!!!!!!!!

 

[CMiuc12s]

i am guessing ignition timing. Need help fast anyone!!!

 

[TSIfreek]

Double check your spark plug wires on your coil and going t the plugs. You may have 2 crossed some were.