Regarding a couple of your queries:
I really like Pistoleros. Ghidra is excellent. It also has a nice score. The director, Alfio Caltabiano, plays a terrific villian.
A DVD-R version with an English audio of The Big Gundown is available at this site: http://xploitedcinema.com/catalog/gundown-franco-cleef-reconstruction-dvdr-p-5250.html
In this particular version, the scenes that were never released in an English speaking country remain in Italian with English subtitles. The quality of the print is very good and most of the scenes do have Englsih audio.
Matalo! and Kill And Pray are both strange films but in different ways. It all comes down to personal preference but I really did not like Matalo! too much. Kill And Pray is directed by Carlo Lizzani and is something of a quasi-political film. The famous Italian director Pier Paolo Pasolini has a part in this film as something of a warrior-priest. Castel's character is nothing like the one he plays in Bullet For The General. Whereas in Bullet he is a cynical fellow, in this he is almost an innocent. Kill And Pray is a quirky, but very interesting, film. And very entertaining to me.