New engine startup, need a bit of help

[bmxmon]

Hey, I just fired up my 302, it started, but is pretty fumbly. My problem is that when i dont work the throttle to get it going (takes probably about 30secs-1min to get it going) it makes a gurgeling noise, or an air bubble noise (Blurp, blurp) Then, it starts a fire in the exhaust manifold (new headers are on the way!) Its not an exhaust fire, justs a steady burn, plus the engine doesnt fire up. I havent been able to get the timing set exactly yet, so its pretty much just in the general area. Would it be too much fuel, or what?? thanks, I will run home asap after school (RRRrr) and hopefully get it running decent. Thanks.