tombffxnt, the last Pinto was built 38 years ago in 1980, the first 2.3 in 1974, 44 years ago. Finding an engine, especially a decent one will not be that easy. That said the greater 2.3 engine was built until 2001 but there were many changes and not everything is adaptable.
I do not deal with a regular wrecking yards. But I have experience with hundreds of trips to self serve yards. I haven't seen a Pinto in about 3 years and those I have found were "well worn." If you need an engine you might consider rebuilding the one you have, or adapting a later 2.3. But all that will be predicated on the desire to keep the car stock, modify it, your skills and your budget. all the best in your search.