New 383 wont fire

Ok, I am getting a headache tracking down the problem.....heres what i have

1966 383 block, fresh rebuilt by me, with help from a buddy that i have seen and ridden in plenty of his cars in which he built the motor. I do not suspect in anyway the motor was built incorrectly....

We went to fire the car after installing in the car, and were not getting anything. We are getting backfire through the exhaust, and no backfires when swapping 180 degrees. Today we checked the stroke and are at tdc and timed properly. I was having issues with the carb, that came off my 72 rr a few years back. fuel was spitting out of the front breather vent. i cleaned the needle and all seems good. We are not getting any fire at all. checked all wires and they are all getting continuity, and priming with gas is getting us not even a sputter.
cam is a used hydraulic FT, and came from my buddys satellite.

any input is appreciated!