well not being great at the engine numbers , i THINK somehow you ended up with a vc160 setup on it , the only 160 i ever seen with a longreach plug n21 or b4es except for the corvette's and the like , but should be ok if its not hitting the deck somewhere or just change the plate .
so if you remove the plug it spins freely then back in a and locks up again ? and are you still getting fuel coming of all over the place ? had some i tipped over and got almost a litre out the plug hole after MR or MISS fixit has had a play flooded so bad not a hope they would run
