Starter question

[rgunlock]

I'm having a problem that I believe is heat soak of my starter, or just a starter on its last legs. I've spent quite a bit of time reading threads on this topic, and I know that there are a number of things that can cause my symptoms. I would like to replace my starter with a mini-starter but having trouble figuring out which one works.

I've got a 1978 GMC K15 with sbc 350 and manual transmission. The starters that RockAuto show for my truck have 9 teeth. The threads I've found that provide any detail on a mini-starter replacement say to purchase a starter for a 1998 Tahoe with 5.7L. The starter for the Tahoe shows it has 11 teeth.

I assume this won't work in my truck, so I'm looking for suggestions on what to shop for that will work. Thanks!