try manually holding the throttle plate open (clear the flooded condition). I assume you spun the engine overafter puttingthe oil in the cylinders, before you put the NEW plugs in....

 

unless you are missing fuel pressure... fast check is to put a pressure guage on.. or you can just push in the shrader valve and see if fuel pissess out but be careful.. will spray if you have good fuel pressure. but not a 100 % good test. if good it still can be flooded.. if you have time just let it air out sometimes they can be really flooded.. and sometimes you can just pull the fuel pump relay and when it starts to fire plug it back in.