904-727 swap Torque converters...

So the 727 torque converters ring gear is still larger than my starter can mesh with, d’you know off hand if there a particular starter i need to switch to, to make the 318 work with the 67-79 a727? Im out in the country so just biting the freight bullets is an issue if i have to send it back again. The 904’s ring gear was 12” OS diameter, all the 727s are 13”. I think I've heard they started using a different starter after 87/88(my truck is and 88 lol *face palm), so hoping you can clarify for me whether or not i should just order the 70’s model starter for the 318/727 pairing