the Pitts is not suitable as a training aircraft for tailwheel endorsements.
too much vision impairment for safe training.
Most of my relatively limited experience is in tailwheel aircraft, but ones with good forward visibility, and I'll second (third?) that! Its a lot easier when you can see where you're going.
An instructor friend of mine just bought a Citabria and other than getting checked out in a new type, I'm using it as an opportunity to learn the aircraft from the back seat too, with him in front. The first landing from the back was 'interesting' - I dropped it in from a foot or more
I'm doing this for the price of fuel only, so in future I'm hoping to be kinder to my friend's plane. The same guy has a Pitts too, so you can imagine where I'm interested in going...