Indeed, but even more I am interested in these rumours concerning a clean sheet design of a fighter that has been suggested by Grumman as a successor for the J-8 at a later stage ...
Yes, but according to the rumours I‘m referring to, the Sabre II - aka a Super-7 as a J-7PLUS - was run in parallel to the J-8II Peace Pearl avionics update And this secret idea for a new fighter was aimed for a later date after these two. Even more the J-13 was long dead and I don‘t think that a warmed up J-13 even with US engines would be what the PLAAF wanted and what Grumman offered.
In that case maybe revival of Tigershark? I don’t see the US sharing the latest and greatest with China, even during the honey moon period.