Won't Fire - Need Help!

I guess it's okay to have a bad memory as long as you remember to take pictures... Assembled most of the motor back in April and was difficulty with timing gear alignment because of the 3 crank keyways and faint dot, so I did take a pic with my camera phone... The pic was how I was planning to assemble, so looks like it's correct with the crank key @ about 2 o'clock.

So, will move forward, tighten, and recheck everything and start the tuning process... Hopefully, initial start-up backfire was due to lack of advanced timing...

Thanks guys! More to come!!