Any gear drive starter will fit any engine for which a gear drive was originally made, which pretty much includes all slants, small block and big block V8's in cars and light trucks. I've been told they also will fit 426 hemis, although that is not what they came with. I don't know about "heavy" trucks and class A motorhomes, or industrial or marine.
"Why" you would want to use one in this day and age, is beyond me, and I'm an old guy, VERY difficult to teach new tricks, LOL