I can’t understand what all the fitment issues are with these starters. I’ve used them on big and small blocks for years without any trouble. I’ve gotten them on eBay, junkyards, local auto parts stores. On my Keith Black block I did have some minor block grinding to do but it was a five minute job.
Yes they have always worked for me as well with minimal work. Of course you have to take off the black plastic "adapter" most of them come with, and I had one that the studs were a little close to the block so I ground them a little shorter. Headers are a wild card, of course as they are all a little different, but I was able to make them work with 2 kinds of those as well fairly easily.
Not sure what the variable is that is causing some folks trouble?