Ahh, can see those pesky parts catalogues have confused some on here huh!
There are only 2 starters types for all chevy v8 engines up until the LS series. Different tooth counts of flexplate/flywheel and these are usually to do with it being a small block or a big one, the mounting bolt pattern is also different. Thats all there is, thankfully americans dont like to make things any more complicated than they need to be. Just make sure you have it shimmed correctly or you will chew up the gears and wish u never touched it.
Theres an awful lot of part commonality between vehicles in the 70-90s era on all american vehicles which makes them easy relatively easy to get bits for and work on.
Shame the rest of the automotive industry has since convinced them that they are wrong and need to make a slight variation on every part in every vehicle model every other year. Would hate the job in motor factors, terrible mess it must be!
Im not looking forward to when cars from early 2000s disappear and we are left with all those gadgets that hide electrical nightmares the marketing department has told peeps they need. You may have spotted the changes in the MOT that have been made to ensure when your novelty electrical coffee cup holder kicks the bucket it will only be fit for the scrap heap.
Oh and just to ruin our fun even more theres a new Euro emissions ruling coming out, you know what that means?! Tiny engines with large turbos and six lambda sensors. Ahahahaha