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You know, actually if anyone needed a bolt like that I don't have a clue where you would get one, and would probably have to make it.
There are two special bolts on each 427 marine motor (and all FE variants).
No matter which side of the motor you are on, if you look at the assembly it will be the second rocker stand from the left that is the oil feed, and this also takes a very special bolt that is necked down to promote oil flow. These bolts are longer and have a necked shank