The factory type started needs to be retained by 3 bolts one of which goes on the non gear end of the starter with a bracket to keep the starter from cocking under load.
Also the two main bolts need to started bolts which have minimal side to side play in the starter nose casting.
You may not have the proper starter gear to flywheel gear clearance either.
Between the two gears when there meshing you should be able to get a leg of one of those big paper clips in there, so we are taking like .030”
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