fuel spitting out the exhaust is caused by ur pressure line being to short/low. either make it longer and/or find a way to raise that above the fuel tank and it wont come out as much. the lsn should be flush with the housing, then 1/2 turn in. but most likely its revving due to the idle being set to high. take off ur air filter and make sure that opening when full brake is applied is a little bit open. like 3/32 of an inch is what ur shooting for. the hsn needle should be around 2 turns out. most people dont realize that the hsn is the needle that controls everything. if this is set wrong, it wont start. lsn is the second "control" in a carb while the hsn is the "primary fuel controller"

and try starting it with the wheels off the ground with partial throttle. should start right up then let off on the gas