dssur
+1y
The redline carb is the 38 dges, its a little overkill for a stock motor.
You would probably be happier and get better mileage with the 32/36 DGEV. It is the same carb as used on a old Volvo, or an old BMW. The difference is the mounting kit.
Some people use the Holley 5200 because you can get it from Autozone for 150 bucks or less and it will still use the weber mounting kit. You WILL need to fabricate linkage for this carb though, it is a pretty exact copy of the DFEV which is a mirror image of the DGEV. There is a writeup on mazdatruckin.com on how to make the linkage and tune this carb.
The header, only one comapny makes one, PAcesetter, and they dont list 92 mazdas as fitting because there are different emissions requirements for that year. It still fits, it even fits automatics even though they say it doesnt.
If you get a pacesetter, GET A CERAMIC COATED one. It costs about 100 dollars more, but it will never corrode, the thin wall of the header piipes will rust out in no time and you'll need a new one. Ebay is the cheapest right now, just look for b2200 header (there is an exhaust part called the header, dont buy that by mistake, make sure it says pacesetter). Nopi used to be cheaper, but I checked a week ago and they have raised their price.