[1963ford]

now i may not own a mustang but the parts on my car were used on the mustang..my fairlane has the autolite 2100 and i found after i rebuilt it that gas shot out the breather hole and the two brass bits at the top..im confused and wondering what that could be

 

[Explorer]

Float set too high, needle valve not closing would be my first guess.

 

[scrapman]

Float set too high, needle valve not closing would be my first guess.

+1 If gas is coming out of your fuel bowl vents, then the needle and seat aren't shutting off the fuel to the bowl. It could be an incorrect float level, or crud in the needle/seat area.