I took my Solex off and bought a 32/36 weber dgav on ebay with air filter for $100 used. This was a great buy, the car is a whole new animal now. My 1.9L is getting with it, and its a wagon. Follow my short list of steps you will be glad. You DO NOT need any adapters whatsoever, bolt straight on!!!
1)Remove solex carb.
2)*remove the clumsy linkage system and go to a cable throttle*
3)get some make a gasket material. You will need thicker gasket than factory. Use old gasket to trace it out, use sharp knife to cut out gasket, do not use any sealants
4)install new weber.
5) I added a pull choke, not crazy about hot water going to my carb. You can buy aftermarket pull choke cable setup. The weber I bought was ready for a pull choke.
Before I did this my car was as slow as a golf cart, now I am the first one out once the light turns green.
***** change from linkage to cable. I went to junk yard bought a throttle cable off some wrecked car. Does not matter make or model, just get cable long enough. I was able to keep factory gas pedal and attached my cable to the pedal assm where it comes from cockpit to firewall. I had to make some brackets and bolt to car to mount the cable, it must be fastened tight to car with no slack. look at design on junk car before removing. Trust me, this cable deal is worth the 2 hours you may have to invest. That linkage system is so mickey mouse you are losing loads of power!!!