dssur
+1y
weber kits are about 350 shipped. You can get a Holley 5200 from Autozone for about 110, but you will still need to buy the weber-to-mazda adapter (same mounting), and the linkage is on the other side of the carb so it will need to be fabricated, there is no adapter to put a 5200 on a mazda.
There is a write up on using the 5200 on mazdatruckin.com