Timing may be 180 out. The distributor actually drops in two ways and it could have turned 180 degrees while you had it out. It is possible that it is in close to right and still backfired but I'm guessing it is off by a lot. I would love to help but I realize Valencia is a bit of a drive for you. You are welcome to give me a call and I can walk you through it.
Dustin
661-755-0620