72 olds 88, won't start, lots of popback

Okay, so I'm working on my cousin's 72 Delta 88 , he drove it to my house but after the second day I've been unable to get it started again. I've checked the plugs and wires, put the wires into harnesses, replaced the coil, static timed it, and STILL can't get the sucker to fire up. The couple times it's caught it pops back crazy loud, I just can't figure out why. It's definitely getting gas, and when I pump the accelerator it acts like it almost wants to fire, but doesn't. Anybody have any ideas as to what I'm looking at here?

Welcome to AF. Make sure you have strong spark and 30 degrees dwell for the points (.016 gap) opening, the wires on the coil are back on properly, recheck the #1 position and your timing setting, all basics on this engine.