Modded predator won't start or run

#1
Hey guys I have a predator with a mod2 cam milled head and a .38 jet and 140 emulsion and a stair pipe and air intake. It takes awhile for it to start and when it does it screams then it does out unless I keep gas on it. I double check the carb and cleaned it out and I'm running 89 gas. And thoughts I have a race tomorrow and this is killing me
 
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