hey guys here my problem, i bought a truck with no carb. i put a holly on and went to start it it ran but half of the carb was squirting out the top like a water fountain. so my buddy had a truck that he drove to my house and we took edlebrok carb off that and put it on my truck. now when i try to start it the carb catches fire real bad. why is it doing this. timing should be right cause it ran on holly, both carbs are bout same size i think new one is smaller. dose it have anything to do with the spacer i had to use for the holly that is still on there. bad gasket? HELP

Steve