Gamera vs Zigra (1971) look like it would be just a great movie?
thus making the viewing experience even not as good. Zigra was for many years one of the Grails of Japanese fandom over here in the States, since it was never released to tv by AIP. a Titra dub could only have helped, and maybe some judicious editing.
the widescreen presentation does make it look a lot better than one might think.
Zigra does look pretty cool, overall.