First time engine build won't fire

I have a 360 i rebuilt it is my first time and I took my time doing it to avoid mistakes but I am beginning to feel like I've missed something. I have the motor in the car now a 74 duster, and for the life of me it will not fire. I found that i had the distributer drive gear clocked in wrong i have since fixed that and I've checked my wires again and again and it still will not fire. I am getting spark and fuel in fact it is spitting gas back out the carb. Any suggestions ?

Follow the instructions from 67Dart273 (Del) ...

If you have a good spark, set the initial timing to 10° like Del has described above...

If the carb is still dry and won't squirt gas when you cycle the accelerator, then get a jar and pour a little gas down the carb while holding the throttle blades open, then close the throttle and try to start it... If it doesn't start, then pour a little more gas down and try again until the carb is "primed" and you can get gas to squirt...

As long as you have gas, spark, and the timing chain is correctly installed, you should be able to get her to start...

Set the initial timing to 10° - 15° BTDC or where you can get to run steady, play around with turning the distributor - set it to where you begin get the max vacuum and leave it there until the engine reaches temp...

Once started, then set the timing to 34° - 36° BTDC at 2000 - 2500 RPM once it is warm...

Then let it run for 45 minutes to break in the cam, making sure to watch the oil pressure and water temp... Check water temp about every 5 - 10 mionutes while breaking in the cam to be sure you don't overheat... If it starts overheating, shut it down or get a garden hose and run it over the radiator to get the temp back down...