A lot of slant racers use the cam stop. Again "personally" I don't see the need for one. But if you are concerned, it is cheap and easy to do, and will not hurt anything, as long a it is set properly.
I don't know of any engine using a flat tappet cam (in the block), that has a forward thrust stop, from the factory. But I shouldn't say this out loud. I don't know everything. :oops:
