Need some help on which direction to go because when cranking up the engine it backfires bad. Just installed brand new spark plugs but when i checked them they are completely saturated with gas. Could it be a bad carburetor (Holly 750)? Worried about firing it up again because of the backfiring and startup problems just looking for a little help on what my first step should be. This engine has no timing chain but is gear driven. If more info is needed just post and ill let you know. Thanks in advance.