NGK PLUGS
360 j heads 9 2 1 30 over
Ok the spark plugs will fit those heads
(As long as the threaded length is not too long.)
But it's ngk 4 heat range which is a little on the hot side in my opinion.
Maybe something in a 5 or 6 heat range
Would be a better choice.
I run a different brand spark plug.
But I'm sure there's people here that can help with a ngk suggestion.