starting problem

Im a bit confused on why my car wont start up. Im running MSD-6AL-2 Ignition Control to a MSD distributor, I did a spark test and it dose have spark. checked the carb and i have fuel. motor cranks over just like normal but never fires up. i also switched out the battery for one that im 100% positive works, and still the same problem:banghead: Am I forgetting to check something

any advice would be very helpful