I use Luminition optical system on my 1600. It requires fitting a "chopper" under the advance . Maybe you can fit a Luminition setup.
See
https://autocar-electrical.co.uk/images/pdf/pdf_optronic/fitting_kits/FK730-installation.pdfFrom memory this Lada (!!!) uses same or similar Marelli style distributor to the 1600. The 1300 is a different set up with FK720
Use a PMA60 detector and standard Luminition electronics pack. I have these on my Fulvias and have found them very reliable (The electronic box needs a really goo chassis contact....
I also have recently tried Powerspark on another car (TR6) and cannot fault it (complete distributor for £80 new).