my 1991 chevy scottsdale, has a problem.?

its a 350. when i turn it on it stalls for a couple seconds then it starts up. then like 2 seconds after it turns on white smoke comes out. its not vapor cus its too much of it to be vapor. its alot of white smoke. it smells like fuel but im not sure, ive looked for the problem so many times and i cant seem to find it. can anyone help me out?
 
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