1973 Chevy Monte Carlo No Start - No Spark

Engine Mechanical problem
1973 Chevy Monte Carlo V8 Two Wheel Drive Automatic

I pulled into work and the car died, I tried to restart it but it would just turn over, fire a couple times and act like it was going to start but nothing! I let it sit for the day and tried again later. We determined that the gas guage was bad & that I ran it out of gas so we put a good 1/2 tank in. Still nothing - turn over, act like it was going to start but no start! Tried dripping a little gas in the 2 barrel carb but ended up flooding it. Battery started to drain from cranking it so much so we jumped the battery & continued to try. Early on we could smell gas & see it spurting up through the carb (choke) but it was inconsistent. Tried using starting fluid but at that point we had somehow lost spark all of a sudden as well as fuel pressure? Quite bizzare & I have NO idea what the problem could be? We tried changing the distributor cap, rotor & points/condenser as well as the ignition coil & still no spark & no fuel flow? The fuel pump is a manual pump. I just had a new A/C unit put in about a week ago and I am thinking that maybe the mechanic inadvertantly knocked a wire loose or off but at this point I am thoroughly STUMPED? Please help! Thank You!